- A1.00866u
- B1.0866u
- C1.866u
- D0.1866u
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A magnet is brought towards a coil (i) speedly (ii) slowly then the induced e.m.f./induced charge will be respectively
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(a) More in first case / More in first case |
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(b) More in first case/Equal in both case |
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(c) Less in first case/More in second case |
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(d) Less in first case/Equal in both case |
A current i ampere flows in a circular arc of wire whose radius is R, which subtend an angle 3π/2 radian at its centre. The magnetic induction B at the centre is

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(a) |
(b) |
(c) |
(d) |
The magnetic field due to a current carrying circular loop of radius 3 cm at a point on the axis at a distance of 4 cm from the centre is 54 mT. What will be its value at the centre of the loop
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(a) 250 m T |
(b) 150 m T |
(c) 125 m T |
(d) 75 m T |
When a point source of light is at a distance of one metre from a photo cell, the cut off voltage is found to be V. If the same source is placed at 2 m distance from photo cell, the cut off voltage will be
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(a) V |
(b) V/2 |
(c) V/4 |
(d) V/ |
If we express the energy of a photon in KeV and the wavelength in angstroms, then energy of a photon can be calculated from the relation
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(a) E = 12.4 hv |
(b) E = 12.4 h/ |
(c) E = 12.4/ |
(d) E = hv |