Two identical coaxial circular loops carry current i each circulating in the clockwise direction. If the loops are approaching each other, then
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(a) Current in each loop increases |
|
(b) Current in each loop remains the same |
|
(c) Current in each loop decreases |
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(d) Current in one-loop increases and in the other it decreases |
(c) Current in each loop decreases
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The equivalent resistance of the following infinite network of resistances is
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(a) Less than 4 Ω |
(b) 4 Ω |
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(c) More than 4 Ω but less than 12 Ω |
(d) 12 Ω |
The focal length of a convex lens is 10 cm and its refractive index is 1.5. If the radius of curvature of one surface is 7.5 cm, the radius of curvature of the second surface will be
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(a) 7.5 cm |
(b) 15.0 cm |
(c) 75 cm |
(d) 5.0 cm |
If a power of 100 W is being supplied across a potential difference of 200 V, current flowing is
|
(a) 2 A |
(b) 0.5 A |
(c) 1 A |
(d) 20 A |
$\frac{\text{v}}{4}$
$\frac{\text{v}}{2}$
$\text{v}$
$2\text{v}$
The magnetic field to a small magnetic dipole of magnetic moment M, at distance r from the centre on the equatorial line is given by (in M.K.S. system)
|
(a) |
(b) |
(c) |
(d) |
A galvanometer of resistance 25 Ω gives full scale deflection for a current of 10 milliampere, is to be changed into a voltmeter of range 100 V by connecting a resistance of ‘R’ in series with galvanometer. The value of resistance R in Ω is
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(a) 10000 |
(b) 10025 |
(c) 975 |
(d) 9975 |
The current in a coil changes from 4 ampere to zero in 0.1 s. If the average e.m.f. induced is 100 volt, what is the self inductance of the coil
|
(a) 2.5 H |
(b) 25 H |
(c) 400 H |
(d) 40 H |
