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 |
(d) a, b, c
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The dielectric constant k of an insulator cannot be
|
(a) 3 |
(b) 6 |
(c) 8 |
(d) ∞ |
$\sqrt{\text{gl}}$
$\sqrt{2\text{gl}}$
$\sqrt{3\text{gl}}$
$\sqrt{5\text{gl}}$
In the given figure, when key K is opened, the reading of the ammeter A will be
|
(a) 50 A |
(b) 2 A |
(c) 0.5 A |
(d) |
The maximum efficiency of full wave rectifier is
|
(a) 100% |
(b) 25.20% |
(c) 40.2% |
(d) 81.2% |
The emf of a battery is 2 V and its internal resistance is 0.5 W. The maximum power which it can deliver to any external circuit will be
|
(a) 8 Watt |
(b) 4 Watt |
(c) 2 Watt |
(d) None of the above |
A diminished virtual image can be formed only in
|
(a) Plane mirror |
(b) A concave mirror |
|
(c) A convex mirror |
(d) Concave-parabolic mirror |
