Two circular coils have their centres at the same point. The mutual inductance between them will be maximum when their axes
|
(a) Are parallel to each other |
(b) Are at 60o to each other |
|
(c) Are at 45o to each other |
(d) Are perpendicular to each other |
(a) Are parallel to each other
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If the distance between a point source and screen is doubled, then intensity of light on the screen will become
|
(a) Four times |
(b) Double |
(c) Half |
(d) One-fourth |
The half life period of radium is 1600 years. The fraction of a sample of radium that would remain after 6400 years is
|
(a) |
(b) |
(c) |
(d) |
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)
|
The critical angle of a material is the angle of incidence for which the angle of refraction is:
