- AElectric field
- BMagnetic field
- CPlasma field
- DGravitational field
Explanation:
Gravitational field applies minimum force on cathode rays because gravitational forces are proportional to masses but not charges.
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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 |
Work of electric motor is
|
(a) To convert ac into dc |
(b) To convert dc into ac |
|
(c) Both (a) and (b) |
(d) To convert ac into mechanical work |
When the angle of incidence on a material is 60°, the reflected light is completely polarized. The velocity of the refracted ray inside the material is (in ms–1)
|
(a) 3 |
(b) |
(c) |
(d) 0.5 |
Plate resistance of two triode valves is 2 KW and 4 KW, amplification factor of each of the valves is 40. The ratio of voltage amplification, when used with 4 KW load resistance, will be
|
(a) 10 |
(b) |
(c) |
(d) |
Figure shows the ray diagram of a:
