If a unit positive charge is taken from one point to another over an equipotential surface, then
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(a) Work is done on the charge |
(b) Work is done by the charge |
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(c) Work done is constant |
(d) No work is done |
(d) No work is done
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Magnetic dipole moment of a rectangular loop is
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(a) Inversely proportional to current in loop |
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(b) Inversely proportional to area of loop |
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(c) Parallel to plane of loop and proportional to area of loop |
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(d) Perpendicular to plane of loop and proportional to area of loop |
A metal block is exposed to beams of X-ray of different wavelength. X-rays of which wavelength penetrate most
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(a) 2 Å |
(b) 4 Å |
(c) 6 Å |
(d) 8 Å |
Which of the following statement is true
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(a) Velocity of light is constant in all media |
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(b) Velocity of light in vacuum is maximum
|
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(c) Velocity of light is same in all reference frames |
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(d) Laws of nature have identical form in all reference frames |