- A$\frac{5 R}{6}$
- B$\frac{R}{6}$
- ✓$\frac{36}{5 R}$
- D$\frac{5}{R}$
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The radius of a circular loop is r and a current i is flowing in it. The equivalent magnetic moment will be
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(a) ir |
(b) 2πir |
(c) iπ |
(d) |
The apparent vertical shift of the image of a coin placed at the bottom of a water tank having constant depth of water is proportional to (given refractive index of water = $\mu$).
An ideal coil of 10 henry is joined in series with a resistance of 5 ohm and a battery of 5 volt. 2 second after joining, the current flowing in ampere in the circuit will be
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(a) |
(b) |
(c) (1 – e) |
(d) e |
As a result of interference of two coherent sources of light, energy is
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(a) Increased |
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(b) Redistributed and the distribution does not vary with time |
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(c) Decreased |
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(d) Redistributed and the distribution changes with time |
In case of a semiconductor, which of the following statement is wrong
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(a) Doping increases conductivity |
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(b) Temperature coefficient of resistance is negative |
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(c) Resisitivity is in between that of a conductor and insulator |
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(d) At absolute zero temperature, it behaves like a conductor |
The plane surface of a plano-convex lens of focal length f is silvered. It will behave as
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(a) Plane mirror |
(b) Convex mirror of focal length 2 |
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(c) Concave mirror of focal length f/2 |
(d) None of the above |