- ✓Increases
- BDecreases
- CRemains constant
- DNone of these
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When a potential difference is applied across the ends of a linear metallic conductor
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(a) The free electrons are accelerated continuously from the lower potential end to the higher potential end of the conductor |
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(b) The free electrons are accelerated continuously from the higher potential end to the lower potential end of the conductor |
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(c) The free electrons acquire a constant drift velocity from the lower potential end to the higher potential end of the conductor |
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(d) The free electrons are set in motion from their position of rest |

Four charges are arranged at the corners of a square ABCD, as shown in the adjoining figure. The force on the charge kept at the centre O is
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(a) Zero |
(b) Along the diagonal AC |
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(c) Along the diagonal BD |
(d) Perpendicular to side AB |
If the energy of the photon is increased by a factor of 4, then its momentum
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(a) Does not change |
(b) Decreases by a factor of 4 |
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(c) Increases by a factor of 4 |
(d) Decreases by a factor of 2 |
Assertion : An electron is not deflected on passing through certain region of space. This observation confirms that there is no magnetic field in that region.
Reason : The deflection of electron depends on angle between velocity of electron and direction of magnetic field.
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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 assertion is false but reason is true. |