An aluminium ring B faces an electromagnet A. The current I through A can be altered
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(a) Whether I increases or decreases, B will not experience any force |
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(b) If I decrease, A will repel B |
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(c) If I increases, A will attract B |
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(d) If I increases, A will repel B |
(d) If I increases, A will repel B
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In the absence of other conductors, the surface charge density
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(a) Is proportional to the charge on the conductor and its surface area |
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(b) Inversely proportional to the charge and directly proportional to the surface area |
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(c) Directly proportional to the charge and inversely proportional to the surface area |
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(d) Inversely proportional to the charge and the surface area |
The curve drawn between velocity and frequency of photon in vacuum will be a
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(a) Straight line parallel to frequency axis |
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(b) Straight line parallel to velocity axis |
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(c) Straight line passing through origin and making an angle of 45o with frequency axis |
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(d) Hyperbola |
A strip of copper and another of germanium are cooled from room temperature to 80 K. The resistance of
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(a) Each of these increases |
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(b) Each of these decreases |
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(c) Copper strip increases and that of germanium decreases |
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(d) Copper strip decreases and that of germanium increases |