- ADecreases in a diamagnetic material.
- BDecreases in a paramagnetic material.
- CDecreases in a ferromagnetic material.
- DRemains the same in a diamagnetic material.
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In the following figure, the magnet is moved towards the coil with a speed v and induced emf is e. If magnet and coil recede away from one another each moving with speed v, the induced emf in the coil will be

|
(a) e |
(b) 2e |
(c) e/2 |
(d) 4e |
The wavelength of the energy emitted when electron come from fourth orbit to second orbit in hydrogen is 20.397 cm. The wavelength of energy for the same transition in
is
|
(a) |
(b) |
(c) |
(d) |
A hollow metal sphere of radius 5cm is charged such that the potential on its surface is 10V. The potential at a distance of 2cm from the centre of the sphere
|
(a) Zero |
(b) 10 V |
(c) 4 V |
(d) 10/3 V |
Angle of minimum deviation for a prism of refractive index 1.5 is equal to the angle of prism. The angle of prism is (cos 41° = 0.75)
|
(a) 62° |
(b) 41° |
(c) 82° |
(d) 31° |
If a slab of insulating material 4
thick is introduced between the plates of a parallel plate capacitor, the separation between plates has to be increased by 3.5
to restore the capacity to original value. The dielectric constant of the material will be
|
(a) 6 |
(b) 8 |
(c) 10 |
(d) 12 |
The control rod in a nuclear reactor is made of
|
(a) Uranium |
(b) Cadmium |
(c) Graphite |
(d) Plutonium |