A solid conducting sphere having a charge Q is surrounded by an uncharged concentric conducting hollow spherical shell. Let the potential difference between the surface of the solid sphere and that of the outer surface of the hollow shell be V. If the shell is now given a charge of –3Q, the new potential difference between the same two surfaces is
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(a) V |
(b) 2V |
(c) 4V |
(d) – 2V |
(a) V
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A one metre long wire is lying at right angles to the magnetic field. A force of 1 kg wt. is acting on it in a magnetic field of 0.98 Tesla. The current flowing in it will be
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(a) 100 A |
(b) 10 A |
(c) 1 A |
(d) Zero |
A fisherman is standing on the bank of a lake. To a fish underwater viewing obliquely the man looks:
Assertion : When radius of circular loop carrying current is doubled, its magnetic moment becomes four times.
Reason : Magnetic moment depends on area of the loop.
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(a) If both assertion and reason are true and the reason is the correct explanation of the assertion. |
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(b) If both assertion and reason are true but reason is not the correct explanation of the assertion. |
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(c) If assertion is true but reason is false. |
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(d) If the assertion and reason both are false. |
According to photon theory of light which of the following physical quantities associated with a photon do not/does not change as it collides with an electron in vacuum
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(a) Energy and momentum |
(b) Speed and momentum |
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(c) Speed only |
(d) Energy only |