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You are given several identical resistances each of value R = 10 Ω and each capable of carrying maximum current of 1 ampere. It is required to make a suitable combination of these resistances to produce a resistance of 5 Ω which can carry a current of 4 amperes. The minimum number of resistances of the type R that will be required for this job
|
(a) 4 |
(b) 10 |
(c) 8 |
(d) 20 |
When a wire of uniform cross-section a, length l and resistance R is bent into a complete circle, resistance between any two of diametrically opposite points will be
|
(a) |
(b) |
(c) 4R |
(d) |
The resistance of 1 A ammeter is 0.018 Ω . To convert it into 10 A ammeter, the shunt resistance required will be
|
(a) 0.18 Ω |
(b) 0.0018 Ω |
(c) 0.002 Ω |
(d) 0.12 Ω |
The current sensitivity of a moving coil galvanometer can be increased by
|
(a) Increasing the magnetic field of the permanent magnet |
|
(b) Increasing the area of the deflecting coil |
|
(c) Increasing the number of turns in the coil |
|
(d) a, b, c |
Relative permeability of iron is 5500, then its magnetic susceptibility will be
|
(a) 5500 × 107 |
(b) 5500 × 10–7 |
(c) 5501 |
(d) 5499 |
Two equal point charges are fixed at x = -a and x = +a on the x-axis. Another point charge Q is placed at the origin. The Change in the electrical potential energy of Q, when it is displaced by a small distance x along the x-axis, is approximately proportional to
|
(a) x |
(b) |
(c) |
(d) 1/x |
