Two short magnets placed along the same axis with their like poles facing each other repel each other with a force which varies inversely as
| (a) Square of the distance | (b) Cube of the distance |
| (c) Distance | (d) Fourth power of the distance |
Two short magnets placed along the same axis with their like poles facing each other repel each other with a force which varies inversely as
| (a) Square of the distance | (b) Cube of the distance |
| (c) Distance | (d) Fourth power of the distance |
(d) Fourth power of the distance
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Assertion : In high latitude one sees colourful curtains of light hanging down from high altitudes.
Reason : The high energy charged particles from the sun are deflected to polar regions by the magnetic field of the earth.
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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. |
Unpolarized light falls on two polarizing sheets placed one on top of the other. What must be the angle between the characteristic directions of the sheets if the intensity of the final transmitted light is one-third the maximum intensity of the first transmitted beam
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(a) 75° |
(b) 55° |
(c) 35° |
(d) 15° |
If are the lengths of the emitter, base and collector of a transistor then
|
(a) |
(b) |
(c) |
(d) |

Two beams of light having intensities I and 4I interfere to produce a fringe pattern on a screen. The phase difference between the beams is at point A and p at point B. Then the difference between the resultant intensities at A and B is
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(a) 2I |
(b) 4I |
(c) 5I |
(d) 7I |