- AMagnetic moment per unit volume.
- BMagnetic induction force acting on a unit magnetic pole.
- CNumber of lines of force crossing per unit area.
- DNumber of lines of force crossing per unit volume.
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An electromagnetic wave travels along z-axis. Which of the following pairs of space and time varying fields would generate such a wave
|
(a) |
(b) |
(c) |
(d) |
Substance on the choroid is
|
(a) Japan black |
(b) Nigrim pigment |
(c) Carbon black |
(d) Platinum black |
The figures represent three cases of a ray passing through a prism of angle A. The case corresponding to minimum deviation is
|
(a) 1 |
(b) 2 |
(c) 3 |
(d) None of these |
If the distance between parallel plates of a capacitor is halved and dielectric constant is doubled then the capacitance
|
(a) Decreases two times |
(b) Increases two times |
|
(c) Increases four times |
(d) Remain the same |
If a current of 10 A flows in one second through a coil, and the induced e.m.f. is 10 V, then the self-inductance of the coil is
|
(a) |
(b) |
(c) |
(d) 1 H |
A point source of electromagnetic radiation has an average power output of 800 W. The maximum value of electric field at a distance 4.0 m from the source is
|
(a) 64.7 V/m |
(b) 57.8 V/m |
(c) 56.72 V/m |
(d) 54.77 V/m |