Description : Magnetism at the centre of a bar magnet is
Last Answer : around- zero
Description : I just held a lighter to a magnet and it lost its magnetism. Why?
Last Answer : This is too science-y for me but there’s a well-documented experiment here concluding the fact that heat reduces magnetic fields (or force, or whatever).
Description : When a piece of iron is rubbed with a magnet it acquires magnetism ' What kind of change is this and why ?
Last Answer : When a piece of iron is rubbed by a magnet, it acquires magnetism ' is a physical or positional change. This is because when rubbed by a magnet, no other substance is formed from iron. Again , when a piece of magnetized iron is heated, it loses its magnetism and is converted into ordinary iron.
Last Answer : Magnetism of a magnet A: Physical properties.
Description : What is a magnet that does not keep its magnetism very long?
Last Answer : This would be a temporary magnet.
Description : What is a magnet that retains its magnetism?
Last Answer : We generally refer to this as a permanent magnet.
Description : Using Weber’s molecular theory of magnetism, describe the polarity of the magnetic poles produced by stroking a magnetic material from right to left with the south pole of a magnet.
Last Answer : South pole at the right, north pole at the left.
Last Answer : Magnetism of a magnet can be destroyed by heating, hammering, by inductive action of another magnet.
Description : When a bar magnet is cut into two equal halves, the pole strength of each piece (1) becomes double (2) becomes half (3) becomes zero (4) remains the same
Last Answer : (4) remains the same Explanation: The poles remains same whether the magnet is cut into two equal half or more and also pole strength remains same but magnetic moment reduces due to decrease in the length of ... is called north pole (N-poled of the magnet and the other end the south pole (S-pole).
Description : When a bar magnet is cut into two equal halves, the pole strength of each piece – (1) becomes double (2) becomes half (3) becomes zero (4) remains the same
Last Answer : remains the same
Description : If the stress produced by a prismatic bar is equal to the working stress, the area of the crosssection of the prismatic bar, becomes (A) Zero (B) Infinite (C) Maximum (D) Minimum
Last Answer : (B) Infinite
Description : In a shaft rotated by a couple, the shear force varies (A) From zero at the centre to a maximum at the circumference (B) From minimum at the centre of maximum at the circumference (C) From maximum at the centre to zero at the circumference (D) Equally throughout the section
Last Answer : (A) From zero at the centre to a maximum at the circumference
Description : If a suspended body is struck at the centre of percussion, then the pressure on die axis passing through the point of suspension will be (A) Maximum (B) Minimum (C) Zero (D) Infinity
Last Answer : (C) Zero
Description : When a liquid is flowing through a pipe, the velocity of the liquid is (A) Maximum at the centre and minimum near the walls (B) Minimum at the centre and maximum near the walls (C) Zero at the centre and maximum near the walls (D) Maximum at the centre and zero near the walls
Last Answer : Answer: Option A
Description : Magnitude of shear stress induced in a shaft due to applied torque varies from a. Maximum at centre to zero at circumference. b. Maximum at centre to minimum (not-zero) at circumference. c. Zero at centre to maximum at circumference. d. Minimum (not zero) at centre to maximum at circumference.
Last Answer : c. Zero at centre to maximum at circumference.
Description : If residual magnetism is present in a D.C. generator, the induced e.m.f. at zero speed will be?
Last Answer : If residual magnetism is present in a D.C. generator, the induced e.m.f. at zero speed will be zero.
Description : A steel bar 20 mm in diameter simply-supported at its ends over a total span of 40 cm carries a load at its centre. If the maximum stress induced in the bar is limited to N/mm2, the bending strain energy stored in the ... (A) 411 N mm (B) 511 N mm (C) 611 N mm (D) 711 N mm
Last Answer : (C) 611 N mm
Description : 8. How does a solenoid behave like a magnet? Can you determine the north and south poles of a current–carrying solenoid with the help of a bar magnet? Explain. -Physics-10
Last Answer : A solenoid is a long coil of circular loops of insulated copper wire. The magnetic field produced around the solenoid when the current is passed through it is similar to the magnetic field ... shows the arrangement of magnetic fields produced around the solenoid when current is passed through it.
Description : 1. Draw magnetic field lines around a bar magnet. -Physics-10
Last Answer : Magnetic field lines of a bar magnet emerge from the North Pole and terminate at the South Pole as shown in the figure below.
Description : 1. Why does a compass needle get deflected when brought near a bar magnet? -Physics-10
Last Answer : The compass needle is a small magnet. When the compass needle is brought close to a bar magnet, the magnetic field lines of the compass needle interact with the magnetic field lines of bar magnet, which causes the compass needle to deflect.
Description : If a bar magnet is cut length wise into 3 parts, what will the total number of poles be? -General Knowledge
Last Answer : The answer is '6'
Last Answer : answer:
Description : Are the magnetic lines force of a bar magnets strongest at the end of the magnet or in the middle?
Last Answer : Feel Free to Answer
Description : How will we find out the north pole and south pole of a bar magnet with no markings to indicate poles?
Last Answer : If you roughly know where North is, tie the bar magnet to a piece of thin string so it balances horizontally and let it dangle. Once it stops spinning and waving about, one end should point North. Mark this end as with an N for north.
Description : How can iron fillings be used to map the magnetic field of a bar magnet?
Last Answer : What is the answer ?
Description : If a bar magnet, tied in the middle with a thread, were suspended at the north pole of the earth, it would take (a) a horizontal position (b) a nearly vertical position with its north pole pointing downward (c) a vertical position with its south pole pointing downward (d) a slanting position
Last Answer : Ans:(b)
Description : In an AC generator, direct current from a separate source is passed through the windings of the rotor _____________. A. by means of slip rings and brushes B. by means of a commutator C. by means of rotating bar magnet D. to minimize the danger of arc over
Last Answer : Answer: A
Description : If a bar magnet is cut length wise into 3 parts, what will the total number of poles be?
Last Answer : 6
Description : Magnetic flux linked with a coil can be changed by using an: a. Permanent magnet b.Bar magnet c. Electromagnet d. Horseshoe magnet
Last Answer : b.Bar magne
Description : The only difference between construction of DC generator and Ac generator is that of: a. carbon brush b. Bar magnet c. electromagnet d. Horseshoe magnet
Last Answer : b. Bar magnet
Description : Define magnetic lines of force. Also draw and show magnetic lines of force of a bar type magnet.
Last Answer : Magnetic Lines of force- These are the imaginary lines (having no physical existence) introduced by Faraday for the pictorial representation of the distribution of a magnetic field. OR A line of ... that the tangent at any point gives direction of the resultant force at that point.
Description : Define magnetic lines of force. Show the magnetic lines of force for bar type magnet.
Last Answer : Magnetic linens of force is the imaginary lines for magnetic field of magnet around it. These magnetic lines of forces are introduced by Michael Faraday. The direction of lines of force is from N-pole to S-pole. The figure shows lines of force for bar type magnet.
Description : A bar magnet when suspended freely always points in the? (A) East west direction (B) North south direction (C) vertically upwards (D) vertically downwards
Last Answer : A bar magnet when suspended freely always points in the North south direction
Last Answer : The bar magnet has the dipole moment.
Description : Which research centre announced that it was developing the largest magnet of the world? This largest magnet would weigh 50000 tons. a) CERN, Geneva b) Bhabha Atomic Research Centre, India c) NASA, US d) Neutrino Observatory, India
Last Answer : Answer: (b) Bhabha Atomic Research Centre, India
Description : The Minimum bar spacing should not be less than [ A ] Diameter of the largest bar [ B ] Maximum size of aggregate [ C ] Greater of diameter of the largest bar and maximum size of aggregate [ D ] Greater of diameter of the largest bar and maximum size of aggregate plus 5 mm
Last Answer : [ D ] Greater of diameter of the largest bar and maximum size of aggregate plus 5 mm
Description : If W is the load on a circular slab of radius R, the maximum circumferential moment at the centre of the slab, is (A) WR²/16 (B) 2WR²/16 (C) 3WR²/16 (D) Zero
Last Answer : Answer: Option C
Description : Consider the following statements in respect of steady laminar flow through a circular pipe: 1. Shear stress is zero on the central axis of the pipe 2. Discharge varies directly with the viscosity of the fluid 3. Velocity is maximum at the ... 2 , 3 & 4 (b) 1 & 3 only (c) 2 & 4 only (d)3 & 4 only
Last Answer : (b) 1 & 3 only
Description : Stress in the cross section of a shaft at the centre ________ a. is zero b. decreases linearly to the maximum value of at outer surface c. both a. and b. d. none of the above
Last Answer : a. is zero
Description : The astronomical unit (AU) is the (a) mean distance from the centre of the sun to the centre of the earth (b) mean distance between the surface of the sun to the surface of the earth (c) maximum distance between the sun and the earth (d) minimum distance between the sun and the earth
Last Answer : Ans:(a)
Description : It is easier to carry two buckets of water in one hand each, than to carry only one in one hand because – (1) weights of buckets are balanced (2) centre of gravity falls within the body (3) centre of gravity and centre of equilibrium fall within the feet (4) resultant weight of buckets is zero
Last Answer : (3) centre of gravity and centre of equilibrium fall within the feet Explanation: When the buckets containing equal amount of water are held in both hands, weight is spaced out more evenly than it ... centre of gravity and the centre of equilibrium should fall, in the present case, within the feet.
Description : Rain drops (assumed to be spherical) of radii R1, 2R1, 3R, 4R, a.all of them will be zero b.all of them will be same c.drops of radius R will be maximum d.drops of radius R will be minimum e.107 dynes
Last Answer : d. drops of radius R will be minimum
Description : The firm is said to be in equilibrium when the difference between R and C is: A. Maximum B. Zero C. Minimum D. One
Last Answer : ANSWER: A
Description : At "Break-even point", (1) the industry is in equilibrium in the long run. (2) the producers suffers the minimum losses (3) the seller earns maximum profit (4) the firm is at zero-profit point
Last Answer : (4) the firm is at zero-profit point Explanation: The break-even point (BEP) is the point at which cost or expenses and revenue are equal: there is no net loss or gain, and one has "broken even." For businesses, reaching the break-even point is the first major step towards profitability.
Description : When marginal utility is zero, the total utility is - (1) Minimum (2) Increasing (3) Maximum (4) Decreasing
Last Answer : (3) Maximum Explanation: Marginal utility measures the extra utility (or satisfaction) from consuming an additional unit of a product. Total utility is the total satisfaction from the consumption of the ... in total satisfaction from the consumption of that unit. So the total unit is at maximum.
Description : One item listed on the name plate of a cargo pump motor is 'degrees centigrade rise.' This number is based on _____________. A. normal temperature change from cold to hot B. an ambient temperature ... . minimum heat rise from no load to full load D. maximum degrees centigrade rise from absolute zero
Last Answer : Answer: B
Description : The operating cost of a distillation column at minimum reflux ratio is (A) Minimum (B) Maximum (C) Infinite (D) Zero
Last Answer : (A) Minimum
Description : In a parallel flow heat exchanger, if the outlet temperature of hot and cold fluids are the same, then the log mean temperature difference (LMTD) is (A) Minimum (B) Maximum (C) Zero (D) Infinity