Two plates are at potentials –10 V and +30 V. If the separation between the plates be 2 cm. The electric field between them is
|
(a) 2000 V/m |
(b) 1000 V/m |
(c) 500 V/m |
(d) 3000 V/m |
(a) 2000 V/m
Generate a complete, print-ready paper with questions like this in minutes — across 16+ boards, with answer keys.
Two long conductors, separated by a distance d carry current I1 and I2 in the same direction. They exert a force F on each other. Now the current in one of them is increased to two times and its directions is reversed. The distance is also increased to 3d. The new value of the force between them is
|
(a) –2F |
(b) F/3 |
(c) 2F/3 |
(d) – F/3 |
A uniform but time-varying magnetic field B(t) exists in a circular region of radius a and is directed into the plane of the paper, as shown. The magnitude of the induced electric field at point P at a distance r from the centre of the circular region
|
(a) Is zero |
(b) Decreases as |
(c) Increases as r |
(d) Decreases as |
Banding of a stick when placed in water is because:
What will be the equivalent resistance between the two points A and D
|
(a) 10 Ω |
(b) 20 Ω |
(c) 30 Ω |
(d) 40 Ω |
The process by which a heavy nucleus splits into light nuclei is known as
|
(a) Fission |
(b) α- decay |
(c) Fusion |
(d) Chain reaction |
In a current carrying long solenoid, the field produced does not depend upon
|
(a) Number of turns per unit length |
(b) Current flowing |
|
(c) Radius of the solenoid |
(d) All of the above three |
Two Nicols are oriented with their principal planes making an angle of 60°. The percentage of incident unpolarized light which passes through the system is
|
(a) 50% |
(b) 100% |
(c) 12.5% |
(d) 37.5% |
A moving coil galvanometer of resistance 100 is used as an ammeter using a resistance 0.1 The maximum deflection current in the galvanometer is 100A. Find the minimum current in the circuit so that the ammeter shows maximum deflection
|
(a) 100.1 mA |
(b) 1000.1 mA |
(c) 10.01 mA |
(d) 1.01 mA |
