As per this diagram a point charge +q is placed at the origin O. Work done in taking another point charge -Q from the point A [co-ordinates (0, a) ] to another point B [co-ordinates (a, 0)] along the straight path AB is
|
(a) Zero |
(b) |
(c) |
(d) |
(a) Zero
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A wire carrying a current i is placed in a uniform magnetic field in the form of the curve y = asin
0 ≤ x ≤ 2L. The force acting on the wire is
|
(a) |
(b) iBL |
(c) 2iBL |
(d) Zero |
If a bar magnet of magnetic moment M is freely suspended in a uniform magnetic field of strength B, the work done in rotating the magnet through an angle θ is
|
(a) MB(1- sinθ |
(b) MB sinθ |
(c) MB cosθ |
(d) MB(1 – cosθ) |
What is the path difference of destructive interference
|
(a) nl |
(b) n(λ + 1) |
(c) |
(d) |
A magnet is dropped down an infinitely long vertical copper tube
|
(a) The magnet moves with continuously increasing velocity and ultimately acquires a constant terminal velocity |
|
(b) The magnet moves with continuously decreasing velocity and ultimately comes to rest |
|
(c) The magnet moves with continuously increasing velocity but constant acceleration |
|
(d) The magnet moves with continuously increasing velocity and acceleration |
Magnetic effect of current was discovered by
|
(a) Faraday |
(b) Oersted |
(c) Ampere |
(d) Bohr |
Unpolarized light falls on two polarizing sheets placed one on top of the other. What must be the angle between the characteristic directions of the sheets if the intensity of the final transmitted light is one-third the maximum intensity of the first transmitted beam
|
(a) 75° |
(b) 55° |
(c) 35° |
(d) 15° |
An electron moves with a constant speed v along a circle of radius r. Its magnetic moment will be (e is the electron's charge)
|
(a) evr |
(b) |
(c) |
(d) 2πrev |
