A thick wire is stretched so that its length become two times. Assuming that there is no change in its density, then what is the ratio of change in resistance of wire to the initial resistance of wire
|
(a) 2 : 1 |
(b) 4 : 1 |
(c) 3 : 1 |
(d) 1 : 4 |
(c) 3 : 1
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A storage battery has e.m.f. 15 volts and internal resistance 0.05 ohm. Its terminal voltage when it is delivering 10 ampere is
|
(a) 30 volts |
(b) 1.00 volts |
(c) 14.5 volts |
(d) 15.5 volts |
The permanent magnet is made from which one of the following substances
| (a) Diamagnetic | (b) Paramagnetic | (c) Ferromagnetic | (d) Electromagnetic |
If 
be the electric field strength of a short dipole at a point on its axial line and 
that on the equatorial line at the same distance, then
|
(a) |
(b) |
(c) |
(d) None of the above |
Two long straight parallel conductors separated by a distance of 0.5m carry currents of 5A and 8A in the same direction. The force per unit length experienced by each other is
|
(a) 1.3 |
(b) 1.6 |
|
(c) 16 |
(d) 16 |
