Two plates are 2 cm apart, a potential difference of 10 volt is applied between them, the electric field between the plates is
|
(a) 20 N/C |
(b) 500 N/C |
(c) 5 N/C |
(d) 250 N/C |
(b) 500 N/C
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Two identical short bar magnets, each having magnetic moment M, are placed a distance of 2d apart with axes perpendicular to each other in a horizontal plane. The magnetic induction at a point midway between them is
|
(a) |
(b) |
(c) |
(d) |
What is the ratio of wavelength of radiations emitted when an electron in hydrogen atom jump from fourth orbit to second orbit and from third orbit to second orbit
| (a) 27 : 25 | (b) 20 : 27 |
(c) 20 : 25 |
(d) 25 : 27 |
A toroid has number of turns per unit length n, current i, then the magnetic field is
|
(a) |
(b) |
(c) |
(d) None of these |
At magnetic poles of earth, angle of dip is
| (a) Zero | (b) 45o | (c) 90o | (d) 180o |
A parallel beam of light is incident on a converging lens parallel to its principal axis. As one moves away from the lens on the other side on its principal axis, the intensity of light:
