Description : A toroid having 200 turns carries a current of 1A. The average radius of the toroid is 10 cm. the magnetic field at any point in the open space inside
Last Answer : A toroid having 200 turns carries a current of 1A. The average radius of the toroid is 10 cm. the magnetic field ... 0.5xx10^(-3)T` D. `2xx10^(-3)T`
Description : A current of `0.1 A` circulates around a coil of 100 turns and having a radius equal to `5 cm`. The magnetic field set up at the centre of the coil is
Last Answer : A current of `0.1 A` circulates around a coil of 100 turns and having a radius equal to `5 cm`. The magnetic ... C. `4pixx10^(-5)T` D. `2pixx10^(-5)T`
Description : A circular coil of `20turns` and radius `10cm` carries a current of `5A`. It is placed in a uniform magnetic field of `0*10T`. Find the torque acting
Last Answer : A circular coil of `20turns` and radius `10cm` carries a current of `5A`. It is placed in a uniform magnetic ... Nm B. 3.14 Nm C. 0.314 Nm D. zero
Description : A 100 turns coil shown in figure carries a current of 2 amp in a magnetic field `B=0.2 Wb//m^(2)`. The torque acting on the coil is
Last Answer : A 100 turns coil shown in figure carries a current of 2 amp in a magnetic field `B=0.2 Wb//m^( ... N-m` tending to rotate the side AD into of the page
Description : A planar coil having 12 turns carries 15 A current. The coil is oriented with respect to the uniform magnetic field `B= 0.2hati T` such that its direc
Last Answer : A planar coil having 12 turns carries 15 A current. The coil is oriented with respect to the ... energy of the coil in the given orientation is
Description : A magnetic circuit has effective iron length of 100 cm and it is wound with 800 turns of wire carries 1 A. Find the magnetic field strength.
Last Answer : magnetic field strength
Description : A square coil of edge I having n turns carries a curent i. it is kept on a smooth horizontal plate. A uniform magnetic field B exists in a direction p
Last Answer : A square coil of edge I having n turns carries a curent i. it is kept on a smooth horizontal plate. A uniform ... . `(Mg)/(4niL)` D. `(2Mg)/(niL)`
Description : The magnetic field at the centre of a circular coil of radius `r` carrying current `l` is `B_(1)`. The field at the centre of another coil of radius `
Last Answer : The magnetic field at the centre of a circular coil of radius `r` carrying current `l` is `B_(1)`. The field at the ... `1//2` B. `1` C. `2` D. `4`
Description : A circular current carrying coil has a radius R. The distance from the centre of the coil on the axis where the magnetic induction will be `(1//8)^(th
Last Answer : A circular current carrying coil has a radius R. The distance from the centre of the coil on the axis where the ... 2//sqrt(3))R` D. `R//2sqrt(3)`
Description : A coil of 500 turns is linked with a flux of 25 mwb, when carries a current of 12.5A. Calculate the value of self-inductance.
Last Answer : Ans: Self-Inductance: L = NΦ /I = 500 × 25 × 10-3 / 12.5 = 1 H
Description : An iron ring of mean circumference 80 cm is uniformly wound with 500 turns of wire and carries 0.8A. Find the magnetic field strength.
Last Answer : Ans: Magnetic field strength H = NI /l = 500 x 0.8 / 80 x 10-2 = 500 AT/m
Description : A solenoid has length `0.4cm`, radius 1 cm and 400 turns of wire. If a current fo 5 A is passed through this solenoid, then what is the magnetic field
Last Answer : A solenoid has length `0.4cm`, radius 1 cm and 400 turns of wire. If a current fo 5 A is passed through this ... `6.28xx10^(-7)T` D. `6.28xx10^(-6)T`
Description : Due to the flow of current in a circular loop of radius `R`, the magnetic induction produced at the centre of the loop is `B`. The magnetic moment of
Last Answer : Due to the flow of current in a circular loop of radius `R`, the magnetic induction produced at the centre of the ... )` D. `(2pi BR^(2))/(mu_(0))`
Description : A length of wire carries a steady current. It is first bent to form a circular coil of one turn. The same length is now bent more sharply to give a lo
Last Answer : A length of wire carries a steady current. It is first bent to form a circular coil of one turn. ... ots first value D. two times of its first value
Description : The magnetic field due to a current carrying circular loop of radius 3 cm at a point on the axis at a distance of 4cm from the centre is `54muT`. What
Last Answer : The magnetic field due to a current carrying circular loop of radius 3 cm at a point on the axis at a distance of ... T` C. `125 mu T` D. `75 mu T`
Description : An alectron in a circular orbit of radius 0.05 mn performs `10^(16) "rev"//s.` the magnetic moment due to this ratation of electron is `(in A-m^(2)).`
Last Answer : An alectron in a circular orbit of radius 0.05 mn performs `10^(16) "rev"//s.` the magnetic moment due to ... `3.21xx10^(-24)` D. `1.26xx10^(-23)`
Description : The magneitc field produced at the center of a current carrying circular coil of radius r, is
Last Answer : The magneitc field produced at the center of a current carrying circular coil of radius r, is A. directly ... 2)` D. inversely proportional to `r^(2)`
Description : An electron is travelling at right angles to a uniform magnetic field of flux density 1.2 mT with a speed of 8 × 106 m s-1, the radius of circular path followed by electron is A. 3.8 cm B. 3.7 cm C. 3.6 cm D. 3.5 cm
Last Answer : 3.8 cm
Description : An infinitely long conductor is bent into a circle as shown in figure. It carries a current I ampere and the radius of loop is R metre. The magnetic i
Last Answer : An infinitely long conductor is bent into a circle as shown in figure. It carries a current I ampere and the radius ... (0)I)/(8piR)(pi + 1)` D. zero
Description : Calculate the drift velocity for the electrons in a silver wire which has a radius of 0.1 cm and carries a current of 2 A. Atomic mass of silver=108 a
Last Answer : Calculate the drift velocity for the electrons in a silver wire which has a radius of 0.1 cm and carries a ... silver `=10.5xx10^(3) kg//m^(3)`.
Description : A silver wire of radius `0.1 cm` carries a current of 2A. If the charge density in silver is `5.86xx10^(28)m^(-3)`, then the drif velocity is
Last Answer : A silver wire of radius `0.1 cm` carries a current of 2A. If the charge density in silver is `5.86xx10^(28)m^(- ... -4)ms^(-1)` D. `7xx10^(-4)ms^(-1)`
Description : A rheostat has 100 turns of a wire of radius 0.4 mm having resistivity `4.2xx10^(-7) Omega`m. The diameter of each turn is 3 cm. What is the maximum v
Last Answer : A rheostat has 100 turns of a wire of radius 0.4 mm having resistivity `4.2xx10^(-7) ... the maximum value of resistance that it can introduce ?
Description : An electron moves in a circular orbit of radius 10 cm with a constant speed of `4.0xx10^(6) ms^(-1)`. Determine the electric current at a point on the
Last Answer : An electron moves in a circular orbit of radius 10 cm with a constant speed of `4.0xx10^(6 ... Determine the electric current at a point on the orbit.
Description : Describe an activity to show that the magnetic field lines produced when current is passed through the circular coil. -Biology
Last Answer : Aim : To study the characteristics of magnetic field produced by a current carrying circular coil at its centre. Apparatus Required : Rectangular cardboard having two holes, Thick copper circular coils of different ... the coil.Field lines keep on diverging as we move away from the centre of loop.
Description : When a certain length of wire is turned into one circular loop, the magnetic induction at the centre of coil due to some current flowing is `B_(1)` If
Last Answer : When a certain length of wire is turned into one circular loop, the magnetic induction at the centre of coil due to ... 1)` C. `3B_(1)` D. `27B_(1)`
Description : Current `i` is carried in a wire of length `L`. If the wire is turned into a circular coil, the maximum magnitude of torque in a given magnetic field
Last Answer : Current `i` is carried in a wire of length `L`. If the wire is turned into a circular coil, the maximum magnitude ... iB)/(4pi)` D. `(L^(2)B)/(4pi)`
Description : Find the magnetic field intensity of a toroid of turns 40 and radius 20cm. The current carried by the toroid be 3.25A. a) 103.45 b) 102 c) 105.7 d) 171
Last Answer : a) 103.45
Description : A closely coiled helical spring of radius R, contains n turns and is subjected to an axial load W. If the radius of the coil wire is r and modulus of rigidity of the coil material is C, the deflection of the coil is (A) WR3n/Cr4 (B) 2WR3n/Cr4 (C) 3WR3n/Cr4 (D) 4WR3n/Cr
Last Answer : (D) 4WR3n/Cr
Description : A closely coiled helical spring of radius R, contains n turns and is subjected to an axial loadW. If the radius of the coil wire is r and modulus of rigidity of the coil material is C, the stress developed in the helical spring is (A) WR/ 3 (B) 2WR/ 3 (C) 2WR/ 2 (D) 4WR/ 2
Last Answer : (B) 2WR/ 3
Description : A long wire carries a steady curent . It is bent into a circle of one turn and the magnetic field at the centre of the coil is `B`. It is then bent in
Last Answer : A long wire carries a steady curent . It is bent into a circle of one turn and the magnetic field at the centre of ... ^(2)B` C. `2nB` D. `2n^(2)B`
Description : A 8 metre long simply supported rectangular beam which carries a distributed load 45 kg/m. experiences a maximum fibre stress 160 kg/cm2 . If the moment of inertia of the beam is 640 cm4 , the overall depth of the beam is (A) 10 cm (B) 12 cm (C) 15 cm (D) 18 cm
Last Answer : (A) 10 cm
Description : If a polar molecule has a charge of 4.8 * 10^ (-10) and internuclear distance is 1A then what is its dipole moment ?
Last Answer : 4.8 * 10-10 e.s.u * 1A0 4.8 * 10-10 * 10-8 4.8 * 10-18 e.s.u – Cm = 4.8 Debye Give the mathematical expression to calculate or measure the percentage of ionic Character. % of Ionic Character = (Observed dipole moment / Dipole moment of 100% ionic bond)*100
Description : A wire of length 2 m carrying a current of 1 A is bend to form a circle. The magnetic moment of the coil is (in `A-m^(2)`)
Last Answer : A wire of length 2 m carrying a current of 1 A is bend to form a circle. The magnetic moment of the coil is (in `A ... . `pi//2` C. `pi//4` D. `1//pi`
Description : Calculate the flux density due to a circular conductor of radius 100nm and current 5A in air. a) 10 b) 100 c) 0.1 d) 1
Last Answer : a) 10
Description : A circular flexible loop of wire of radius r carrying a current I is placed in a uniform magnetic field B . If B is doubled, then tension in the loop
Last Answer : A circular flexible loop of wire of radius r carrying a current I is placed in a uniform magnetic field ... is doubled C. is halved D. becomes 4 times
Description : A current `i` ampere flows in a circular arc of wire whose radius is `R`, which subtend an angle `3pi//2` radian at its centre. The magnetic induction
Last Answer : A current `i` ampere flows in a circular arc of wire whose radius is `R`, which subtend an angle `3pi//2` radian at ... 0)i)/(R )` D. `3mu_(0)i)/(8R)`
Description : Find the magnetic field when a circular conductor of very high radius is subjected to a current of 12A and the point P is at the centre of the conductor. a) 1 b) ∞ c) 0 d) -∞
Last Answer : c) 0
Description : Calculate the magnetic field at a point on the centre of the circular conductor of radius 2m with current 8A. a) 1 b) 2 c) 3 d) 4
Last Answer : b) 2
Description : Two circular coils 1 and 2 are made from the same wire but the radius of the 1st coil is twice that of the 2nd coil. What is the ratio of potentail di
Last Answer : Two circular coils 1 and 2 are made from the same wire but the radius of the 1st coil is twice that of the 2nd coil ... the same? A. 3 B. 4 C. 6 D. 2
Description : The magnetic field at a point on the axis of a long solenoid having 5 turns per cm length when a current of 0.8 A flows through it is
Last Answer : The magnetic field at a point on the axis of a long solenoid having 5 turns per cm length when a current of 0.8 A ... )` D. `8.024xx10^(-8) Wb//m^(2)`
Description : The frequency of an alternator at a given RPM is determined by the _____________. A. number of turns of wire in the armature coil B. number of magnetic poles C. strength of the magnets used D. output voltage
Last Answer : Answer: B
Description : One factor that determines the frequency of an alternator is the ____________. A. number of turns of wire in the armature coil B. number of magnetic poles C. strength of the magnets used D. output voltage
Description : E.M.F for a coil depends upon A. the cross sectional area B. no. of turns of wire C. the magnitude of magnetic flux density D. all of above
Last Answer : all of above
Description : Sensitivity of a galvanometer can be increased by a) Increasing the number of turns of the coil b) Decreasing the magnetic field c) Increasing the ratio c ⁄BAN d) Decreasing the area of the coil
Last Answer : a) Increasing the number of turns of the coil
Description : A coil of wire is placed in a changing magnetic field. If the number of turns in the coil is decreased, the voltage induced across the coil will: A. increase B. decrease C. remain constant D. be excessive
Last Answer : A coil of wire is placed in a changing magnetic field. If the number of turns in the coil is decreased, the voltage induced across the coil will: decrease
Description : The induced voltage across a coil with 250 turns that is located in a magnetic field and is changing at a rate of 8 Wb/s is A. 1,000 V B. 2,000 V C.31.25 V D. 3,125 V
Last Answer : The induced voltage across a coil with 250 turns that is located in a magnetic field and is changing at a rate of 8 Wb/s is 2,000 V
Description : Two concentric circular coils of ten turns each are situated in the same plane. Their radii are `20` and `40 cm` and they carry respectively `0.2` and
Last Answer : Two concentric circular coils of ten turns each are situated in the same plane. Their radii are `20` and `40 cm` ... /80)mu_(0)` D. `(25//2)mu_(0)`
Description : A joker’s cap is in the form of right circular cone of base radius 7 cm and height 24cm. Find the area of the sheet required to make 10 such caps. -Maths 9th
Last Answer : Radius of conical cap, r = 7 cm Height of conical cap, h = 24cm Slant height, l2 = (r2+h2) = (72+242) = (49+576) = (625) Or l = 25 cm CSA of 1 conical cap = πrl = (22/7)×7×24 = 550 CSA of 10 caps = (10×550) cm2 = 5500 cm2 Therefore, the area of the sheet required to make 10 such caps is 5500 cm2.
Description : The radius of a circular plate increases by 2% on heating. If its radius is 10 cm before heating, find the approximate increase in its area.
Last Answer : The radius of a circular plate increases by 2% on heating. If its radius is 10 cm before heating, find the approximate increase in its area.
Description : A thick wire of radius `r=5 mm` carries a steady current `I=10 A`. An electron leaves its surface perpendicularly with velocity `v_(0)=10^(6) m//s`. F
Last Answer : A thick wire of radius `r=5 mm` carries a steady current `I=10 A`. An electron leaves its ... from the surface of the wire before it turns back.