The average e.m.f. induced in a coil in which a current changes from 0 to 2 A in 0.05 s is 8 V. The self inductance of the coil is
|
(a) 0.1 H |
(b) 0.2 H |
(c) 0.4 H |
(d) 0.8 H |
(b) 0.2 H
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The speed of an electron having a wavelength of 
is
|
(a) 7.25 × |
(b) 6.26 × |
(c) 5.25 × |
(d) 4.24 × |
The current i in an induction coil varies with time t according to the graph shown
in figure. Which of the following graphs shows the induced emf (e) in the coil with time
|
(a)
|
(b)
|
(c) |
(d)
|
Lateral displacement of the emergent ray of light increases with:
Two wires A and B of same material and same mass have radius 2rand r. If resistance of wire A is 34 Ω, then resistance of B will be
|
(a) 544 Ω |
(b) 272 Ω |
(c) 68 Ω |
(d) 17 Ω |
A ray of light passes through an equilateral glass prism in such a manner that the angle of incidence is equal to the angle of emergence and each of these angles is equal to 3/4 of the angle of the prism. The angle of deviation is
|
(a) 45° |
(b) 39° |
(c) 20° |
(d) 30° |
Two long straight parallel conductors separated by a distance of 0.5m carry currents of 5A and 8A in the same direction. The force per unit length experienced by each other is
|
(a) 1.3 |
(b) 1.6 |
|
(c) 16 |
(d) 16 |
