Explanation:
The electrons in any conductor are under continuous motion but in random way. There's no net crossing of charge carriers through a given cross-section. Without potential difference, the electrons move randomly in all directions.The randomly moving electrons in a metal wire will start moving in a particular direction when a potential difference is applied across it.
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If q is the charge per unit area on the surface of a conductor, then the electric field intensity at a point on the surface is
|
(a) |
(b) |
|
(c) |
(d) |
An uncharged capacitor is connected to a battery. On charging the capacitor
|
(a) All the energy supplied is stored in the capacitor |
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(b) Half the energy supplied is stored in the capacitor |
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(c) The energy stored depends upon the capacity of the capacitor only |
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(d) The energy stored depends upon the time for which the capacitor is charged |
The phase difference between input and output voltages of a CE circuit is
|
(a) 0o |
(b) 90o |
(c) 180o |
(d) 270o |
E.C.E. of Cu and Ag are 
and 1.2 
A certain current deposits 14 gm of Cu. Amount of Ag deposited is
|
(a) 1.2 gm |
(b) 1.6 gm |
(c) 2.4 gm |
(d) 1.8 gm |
The capacity of an air condenser is 2.0 mF. If a medium is placed between its plates. The capacity becomes 12 mF. The dielectric constant of the medium will be
|
(a) 5 |
(b) 4 |
(c) 3 |
(d) 6 |
The principle of controlled chain reaction is used in
| (a) Atomic energy reactor | (b) Atom bomb |
|
(c) The core of sun |
(d) Artificial radioactivity |
