- APositive
- BNegative
- CZero
- DDepends on the nature of the conductor
Explanation:
Net electrostatic field is zero in the interior of a conductor. When a conductor is placed in an electric field, its free electrons begin to move in the opposite direction. Negative charges are induced on the left end and positive charges on the right end of the conductor. The process continues until the electric field set up by induced charges becomes equal and opposite the external field.
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Radius of
nucleus is 3 Fermi. The radius of
nucleus will be
|
(a) 5 Fermi |
(b) 6 Fermi |
(c) 11.16 Fermi |
(d) 8 Fermi |
Two magnets A and B are identical in mass, length and breadth but have different magnetic moments. In a vibration magnetometer, if the time period of B is twice the time period of A. The ratio of the magnetic moments
of the magnets will be
| (a) 1/2 | (b) 2 | (c) 4 | (d) 1/4 |
A galvanometer whose resistance is 120 Ω gives full scale deflection with a current of 0.05 A so that it can read a maximum current of 10 A. A shunt resistance is added in parallel with it. The resistance of the ammeter so formed is
|
(a) 0.06 Ω |
(b) 0.006 Ω |
(c) 0.6 Ω |
(d) 6 Ω s |
An object 5 cm tall is placed 1m from a concave spherical mirror which has a radius of curvature of 20 cm The size of the image is
|
(a) 0.11 cm |
(b) 0.50 cm |
(c) 0.55 cm |
(d) 0.60 cm |
Two identical thin bar magnets each of length l and pole strength m are placed at right angle to each other with north pole of one touching south pole of the other. Magnetic moment of the system is
|
(a) ml |
(b) 2ml |
(c) |
(d) |