A copper ring is held horizontally and a bar magnet is dropped through the ring with its length along the axis of the ring. The acceleration of the falling magnet while it is passing through the ring is
|
(a) Equal to that due to gravity |
|
(b) Less than that due to gravity |
|
(c) More than that due to gravity |
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(d) Depends on the diameter of the ring and the length of the magnet |
(b) Less than that due to gravity
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A charge 
exerts some force on a second charge 
. If third charge 
is brought near, the force of exerted on
|
(a) Decreases |
|
(b) Increases |
|
(c) Remains unchanged |
|
(d) Increases if |
The Avogadro's number is 6 
per gm mole and electronic charge is 1.6 
. The Faraday's number is
|
(a) |
(b) |
|
(c) |
(d) |
In the figure given below, the current passing through 6 Ω resistor is
|
(a) 0.40 ampere |
(b) 0.48 ampere |
(c) 0.72 ampere |
(d) 0.80 ampere |
The figure illustrate how B, the flux density inside a sample of unmagnetised ferromagnetic material varies with B0, the magnetic flux density in which the sample is kept. For the sample to be suitable for making a permanent magnet
|
(a) OQ should be large, OR should be small |
|
(b) OQ and OR should both be large |
|
(c) OQ should be small and OR should be large |
|
(d) OQ and OR should both be small |
A conducting ring of radius 1 meter is placed in an uniform magnetic field B of 0.01Telsa oscillating with frequency 100Hz with its plane at right angles to B. What will be the induced electric field
|
(a) π volt/m |
(b) 2 volt/m |
(c) 10 volt/m |
(d) 62 volt/m |
