- AMoving magnet
- BStationary magnet
- CMoving charge
- DStationary charge
Explanation:
Magnetic fields are produced by magnetic bodies (Moving or stationary).
Moving charges produce electromagnetic fields. Stationary charges produce electric fields alone.
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A piece of fuse wire melts when a current of 15 ampere flows through it. With this current, if it dissipates 22.5 W, the resistance of fuse wire will be
|
(a) Zero |
(b) 10 Ω |
(c) 1 Ω |
(d) 0.10 Ω |
As compared 12C atom, 14C atom has
|
(a) Two extra protons and two extra electrons |
|
(b) Two extra protons but no extra electrons |
|
(c) Two extra neutrons and no extra electrons |
|
(d) Two extra neutrons and two extra electrons |
The brightness of a bulb will be reduced, if a resistance is connected in
|
(a) Series with it |
(b) Parallel with it |
|
(c) Series or parallel with it |
(d) Brightness of the bulb cannot be reduced |
A silver and zinc voltameter are connected in series and a current i is passed through them for a time t liberating W gm of zinc. The weight of silver deposited is nearly
|
(a) W |
(b) 1.7 W |
(c) 2.4 W |
(d) 3.5 W |