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 sun makes 0.5o angle on earth surface. Its image is made by convex lens of 50 cm focal length. The diameter of the image will be
|
(a) 5 mm |
(b) 4.36 mm |
(c) 7 mm |
(d) None of these |
For the given circuit of PN-junction diode, which of the following statement is correct
|
(a) In forward biasing the voltage across R is V |
|
(b) In forward biasing the voltage across R is 2V |
|
(c) In reverse biasing the voltage across R is V |
|
(d) In reverse biasing the voltage across R is 2V |
The maximum efficiency of full wave rectifier is
|
(a) 100% |
(b) 25.20% |
(c) 40.2% |
(d) 81.2% |
The period of oscillation of a vibration magnetometer depends on which of the following factors
| (a) I and M only | (b) M and H only | (c) I and H only | (d) I, M and H only |
Two parallel conductors A and B of equal lengths carry currents I and 10 I, respectively, in the same direction. Then
|
(a) A and B will repel each other with same force |
|
(b) A and B will attract each other with same force |
|
(c) A will attract B, but B will repel A |
|
(d) A and B will attract each other with different forces |
Two parallel wires in free space are 10 cm apart and each carries a current of 10 A in the same direction. The force one wire exerts on the other per metre of length is
|
(a) 2 |
(b) 2 |
|
(c) 2 |
(d) 2 |
Two parallel plates have equal and opposite charge. When the space between them is evacuated, the electric field between the plates is 2 
. When the space is filled with dielectric, the electric field becomes 1 . The dielectric constant of the dielectric material
|
(a) 1/2 |
(b) 1 |
(c) 2 |
(d) 3 |
