Description : A current of 2 A is made to flow through a coil which has only one turn. The magnetic field produced at the centre is`4pi xx 10^(-6) "Wb"//m^(2).` the
Last Answer : A current of 2 A is made to flow through a coil which has only one turn. The magnetic field produced at the centre is` ... m` C. `0.1 m` D. `0.001 m`
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 : The pole faces of U-shaped magnet in a moving coil galvanometer are made concave to a) decrease the strength of magnetic field b) create a non-uniform magnetic field c) make the magnetic field radial d) All of these
Last Answer : c) make the magnetic field radial
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 : Electrons move at right angles to a magnetic field of `1.5xx10^(-2)` Tesla with a speed of `6xx10^(7)m//s`. If the specific charge of the electron is
Last Answer : Electrons move at right angles to a magnetic field of `1.5xx10^(-2)` Tesla with a speed of `6xx10^ ... C//kg`. The radius of the circular path will be
Description : A conductor of length 5 cm is moved paralllel to itself with a speed of `2m//s`, perpendicular to a uniform magnetic field of `10^(-3) Wb//m^(2).` the
Last Answer : A conductor of length 5 cm is moved paralllel to itself with a speed of `2m//s`, perpendicular to a uniform ... `1xx10^(-4)V` D. `2xx10^(-4) V`
Description : A proton beam enters magnetic field of `10^(-4) "Wb//m^(2)` normally. If the specific charge of the proton is `10^(11) C//kg` and its velocity is `10^
Last Answer : A proton beam enters magnetic field of `10^(-4) "Wb//m^(2)` normally. If the specific charge of the proton is `10^ ... . 100 m B. 0.1 m C. 1 m D. 10 m
Description : : Moving a coil in and out of magnetic field induces A. force B. potential difference C. e.m.f D. voltage
Last Answer : e.m.f
Description : In order to increase the sensitivity of a moving coil galvanometer, one should decrease
Last Answer : In order to increase the sensitivity of a moving coil galvanometer, one should decrease A. the strength of ... in its coil D. the area of its coil
Description : In a moving coil galvanometer, the deflection of the coil q is related to the electrical current i by the relation
Last Answer : In a moving coil galvanometer, the deflection of the coil q is related to the electrical current i by the ... theta^(2)` D. `I prop sqrt(theta)`
Description : A moving coil galvanometer has 150 equal divisions. Its current sensitivity is 10-divisions per milliampere and voltage sensitivity is 2 divisions per
Last Answer : A moving coil galvanometer has 150 equal divisions. Its current sensitivity is 10-divisions per milliampere and voltage ... `10^(3)` D. `10^(5)`
Description : A moving coil galvanometer is converted into an ammeter reads upto `0.03 A` by connecting a shunt of resistance `4r` across it and ammeter reads up `0
Last Answer : A moving coil galvanometer is converted into an ammeter reads upto `0.03 A` by connecting a shunt of resistance `4r` ... `0.02A` C. `0.03A` D. `0.04A`
Description : To send 10% of the main current through a moving coil galvanometer of resistance `99omega`, the shunt required is –
Last Answer : To send 10% of the main current through a moving coil galvanometer of resistance `99omega`, the shunt ... `11Omega` C. `10Omega` D. `9.9Omega`
Description : Aboard ship, a grounded field coil in an AC motor can be determined by using a _________________. A. portable growler B. galvanometer C. visual inspection D. megohmmeter
Last Answer : Answer: D
Description : A current of 5 ampere is passing through a metallic wire of cross-sectional area `4xx10^(-6) m^(2)`. If the density of the charge-carriers in the wire
Last Answer : A current of 5 ampere is passing through a metallic wire of cross-sectional area `4xx10^(-6) m^(2)`. If the ... ms^(-1)` D. `1xx10^(-2)ms^(-1)`
Description : What is the drift velocity of electrons in a copper conductor having a cross-sectional area of `5xx10^(-6) m^(2)` if the current is 10 A. Assume there
Last Answer : What is the drift velocity of electrons in a copper conductor having a cross-sectional area of `5xx10^(-6) m^( ... `8.0xx10^(28) "electrons"//m^(3)`.
Description : What is the mathematical formula for computing the output voltage from a moving coil in a magnetic field?
Last Answer : 8. e = Emax sine θ.
Description : The induced current can be increased by: a. Using strong magnetic field b. moving loop faster c. Replacing loop by coil d. all of above
Last Answer : d. all of above
Description : At room temperature copper has free electron density of `8.4xx10^(28) per m^(3)` . The copper conductor has a cross-section of `10^(-6)m^(2)` and carr
Last Answer : At room temperature copper has free electron density of `8.4xx10^(28) per m^(3)` . The copper conductor has a cross ... . `4cms^(-1)` D. `0.4mms^(-1)`
Description : Calculate the energy of hydrogen atom in the ground state given that the after Bohr orbit og hydrogen is `5xx10^(-11)m` and electronic charge is `1.6x
Last Answer : Calculate the energy of hydrogen atom in the ground state given that the after Bohr orbit og hydrogen is ` ... electronic charge is `1.6xx10^(-19) C`.
Description : The angular diameter of the sun is 1920". If the distance of the sun from the earth is `1.5xx10^(11)`m, what is the linear diameter of the sun ?
Last Answer : The angular diameter of the sun is 1920". If the distance of the sun from the earth is `1.5xx10^(11)`m, what is the linear diameter of the sun ?
Description : The electron with change `(q=1.6xx10^(-19)C)` moves in an orbit of radius `5xx10^(-11)`m with a speed of `2.2xx10^(6)ms^(-1)`, around an atom. The equ
Last Answer : The electron with change `(q=1.6xx10^(-19)C)` moves in an orbit of radius `5xx10^(-11)`m with a speed of `2. ... -3)A` C. `1.12xx10^(-9)A` D. `1.12A`
Description : The magnetic field intensity at the centre of a current carrying coil of diameter J m is K. The current flowing in the coil is
Last Answer : The magnetic field intensity at the centre of a current carrying coil of diameter d m is H. The current flowing in the coil is dH
Description : Assertion current sensitivity of a galvanometer is directley proportionall to the current through the coil. Reason Voltage sensitivity is inversely pr
Last Answer : Assertion current sensitivity of a galvanometer is directley proportionall to the current ... sensitivity is inversely proportional to voltage.
Description : The pole pieces of the magnet used in a pivoted coil galvanometer are
Last Answer : The pole pieces of the magnet used in a pivoted coil galvanometer are A. plane surfaces of a ... magnet D. cylindrical sufaces of a horse-shoe magnet
Description : A galvanometer has a coil of resistance `100 Omega` and gives a full-scale deflection for `30 mA` current. If it is to work as a voltmeter of `30 V` r
Last Answer : A galvanometer has a coil of resistance `100 Omega` and gives a full-scale deflection for `30 mA` current. ... Omega` C. `1000 Omega` D. `1800 Omega`
Description : In a galvanometer, what two methods are used to indicate the amount of coil rotation?
Last Answer : The pointer arrangement and the light and mirror arrangement.
Description : What physical component of a galvanometer provides the restoring force for the coil?
Last Answer : Phosphor bronze ribbons.
Last Answer : he pointer arrangement and the light and mirror arrangement.
Description : A galvanometer with 20 ohms coil resistence has a full-scale deflection of 10 mA. A 0.02 ohm is placed across the meter to increase its rating capacity. What is the new full scale current for the meter?
Last Answer : False.
Description : The current I passing through the galvanometer coil is related to the angle of deflection θ as a) I ∝ θ b) I 1/∝ θ c) I ∝ θ 2 d) I 1/∝ θ 2
Last Answer : a) I ∝ θ
Description : A galvanometer in which the coil quickly comes to rest is called a ________ galvanometer a) Ballistic b) Mirror c) Astatic d) Dead beat
Last Answer : d) Dead beat
Description : Which one of the following is the way in which a galvanometer is converted into a voltmeter? Is it by connecting: w) a high resistance coil in parallel with its moveable coil x) a low resistance ... coil in series with its moveable coil z) a low resistance coil in series with its moveable coil
Last Answer : ANSWER: Y -- A HIGH RESISTANCE COIL IN SERIES WITH ITS MOVEABLE COIL
Description : When field is parallel to plane of area, magnetic flux through coil isA. zero B. infinite C. 2 D. 5
Last Answer : zero
Description : The induced emf in a coil depends upon: a. Strength of magnetic field b. Resistance of the coil c. area of the coil d. All of them
Last Answer : d. All of them
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 : A moving particle of charge q and mass m enters a uniform magnetic field perpendicular to the direction of field. Then
Last Answer : A moving particle of charge q and mass m enters a uniform magnetic field perpendicular to the ... circular path (D) its velocity vector changes
Description : An electron is moving in a circular path under the influence fo a transerve magnetic field of `3.57xx10^(-2)T`. If the value of `e//m` is `1.76xx10^(1
Last Answer : An electron is moving in a circular path under the influence fo a transerve magnetic field of `3.57xx10^(-2)T`. ... MHz` C. `62.8 MHz` D. `6.28MHz`
Description : A proton of mass m and charge q is moving in a plane with kinetic energy E. if there exists a uniform magnetic field B, perpendicular to the plane mot
Last Answer : A proton of mass m and charge q is moving in a plane with kinetic energy E. if there exists a uniform magnetic ... Em))/(2qB)` D. `(sqrt(2Eq))/(qB)`
Description : An electron is moving on a circular path of radius `r` with speed `v` in a transverse magnetic field B. e/m for it will be
Last Answer : An electron is moving on a circular path of radius `r` with speed `v` in a transverse magnetic field B. e/m for it ... /Br` B. `B/rv` C. Brv D. `vr/B`
Description : If edge length of an unit cell `=4xx10^(-8)` cm and the unit cell is a face-centered cubic with atomic mass of metal is 40 then density of the unit ce
Last Answer : If edge length of an unit cell `=4xx10^(-8)` cm and the unit cell is a face-centered cubic with atomic mass of ... /(24) `gm/ml D. `(1)/(4)` gm/litre
Description : If the forward rate constant of reversible reaction is 0.16 and backward rate constant is `4xx10^(4)` , then the equilibrum constant will be .
Last Answer : If the forward rate constant of reversible reaction is 0.16 and backward rate constant is `4xx10^(4)` , then the ... C. `4xx10^(-6)` D. `4xx10^(-5)`
Description : In the electrolysis of silver chloride, a charge of `4xx10^(5)` C is flowing through the electrolyte. Calculate the number of silver `(Ag^(+))` ions f
Last Answer : In the electrolysis of silver chloride, a charge of `4xx10^(5)` C is flowing through the electrolyte. ... silver `(Ag^(+))` ions flowing through it.
Description : An electron in potentiometer experiences a force `2.4xx10^(-19)N`. The length of potentiometer wire is 6m. The emf of the battery connected across the
Last Answer : An electron in potentiometer experiences a force `2.4xx10^(-19)N`. The length of potentiometer wire is 6m. The emf of ... 6 V B. 9 V C. 12 V D. 15 V
Description : Which of the following conditions will occur if the solenoid coil burns out on a cargo winch with an electrical brake? A. The brake will be set by spring force. B. The motor will overspeed and burn ... the cargo boom will fall. D. Nothing will happen; the winch will continue to operate as usual.
Last Answer : Answer: A
Description : `K_(p)` value for `C_(2)H_(4(g))+H_(2(g))rArrC_(2)H_(6(g))is 5xx10^(18)" atm"^(-1)andK_(p)"` for `C_(2)H_(2)+H_(2(g))rArrC_(2)H_(4(g)) " is "5xx10^(26
Last Answer : `K_(p)` value for `C_(2)H_(4(g))+H_(2(g))rArrC_(2)H_(6(g))is 5xx10^(18)" atm"^(-1)andK_(p)"` for ... ^(8)` C. `1.5xx10^(-45)` D. `2.5xx10^(-45)`
Description : `._(92)^(238)U` atom distintgrates to `._(84)^(214) Po` with a half life of `4.5xx10^(9)` years by emitting six alpha particles and n electrons. Here
Last Answer : `._(92)^(238)U` atom distintgrates to `._(84)^(214) Po` with a half life of `4.5xx10^(9)` years by emitting ... . Here n is - A. 6 B. 4 C. 10 D. 7
Description : A 10 C of charge flows through a wire in 5 minutes. The radius of the wire is 1 mm. It contains `5xx10^(22)` electrons per `"centimetre"^(3)`. Calcula
Last Answer : A 10 C of charge flows through a wire in 5 minutes. The radius of the wire is 1 mm. It ... centimetre"^(3)`. Calculate the current and drift velocity.
Description : A rectangular coil of copper wires is rotated in a magnetic field. The direction of the induced current changes once in each -Physics-10
Last Answer : half revolution When a rectangular coil is rotated in magnetic field, the direction of the induced current changes once in half revolution. As a result, the direction of the current in the coil remains the same. In text 13.7 Page:238