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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Assertion : Coloured spectrum is seen when we look through a muslin cloth.
Reason : It is due to the diffraction of white light on passing through fine slits.
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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 Gauss’ Theorem, electric field of an infinitely long straight wire is proportional to
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(a) r |
(b) |
(c) |
(d) |
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 |
Effective resistance between A and B is
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(a) 15 W |
(b) 5 W |
(c) |
(d) 20 W |
The e.m.f. of a cell is E volts and internal resistance is r ohm. The resistance in external circuit is also r ohm. The p.d. across the cell will be
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(a) E/2 |
(b) 2E |
(c) 4E |
(d) E/4 |
When objects at different distances are seen by the eye, which of the following remains constant
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(a) The focal length of the eye lens |
(b) The object distance from the eye lens |
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(c) The radii of curvature of the eye lens |
(d) The image distance from the eye lens |
