Statement (B): Electric potential is vector.
- AA is true but B is false.
- BB is true but A is false.
- CBoth A and B false.
- DBoth A and R are true.
Explanation:
Positive charges move from higher to lower potential whereas negative charges move from lower to higher potential. Hence, A is false. Electric potential does not have direction and is a scalar quantity.
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The coil of dynamo is rotating in a magnetic field. The developed induced e.m.f. changes and the number of magnetic lines of force also changes. Which of the following condition is correct
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(a) Lines of force minimum but induced e.m.f. is zero |
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(b) Lines of force maximum but induced e.m.f. is zero |
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(c) Lines of force maximum but induced e.m.f. is not zero |
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(d) Lines of force maximum but induced e.m.f. is also maximum |
Angle between equipotential surface and lines of force is
|
(a) Zero |
(b) 180° |
(c) 90° |
(d) 45° |

If a photon has velocity c and frequency n, then which of following represents its wavelength
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(a) |
(b) |
(c) |
(d) hv |