Kinetic energy of emitted cathode rays is dependent on
|
(a) Only voltage |
|
(b) Only work function |
|
(c) Both (a) and (b) |
|
(d) It does not depend upon any physical quantity |
(c) Both (a) and (b)
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The alternating voltage induced in the secondary coil of a transformer is mainly due to
|
(a) A varying electric field |
(b) A varying magnetic field |
|
(c) The vibrations of the primary coil |
(d) The iron core of the transformer |
Two long straight wires are set parallel to each other. Each carries a current i in the same direction and the separation between them is 2r. The intensity of the magnetic field midway between them is
|
(a) |
(b) 4 |
(c) Zero |
(d) |
In a negative logic the following wave form corresponds to the
|
(a) 0000000000 |
(b) 0101101000 |
(c) 1111111111 |
(d) 1010010111 |
What is a virtual image?
Which of the following is not an application of eddy currents
|
(a) Induction furnace |
(b) Galvanometer damping |
|
(c) Speedometer of automobiles |
(d) X-ray crystallography |
