- ARepel
- BAttract
- CStrike
- DAll
Explanation:
Like magnetic force repel each other whereas unlike magnetic poles attract each other.
Generate a complete, print-ready paper with questions like this in minutes — across 16+ boards, with answer keys.
Plane polarised light is passed through a polaroid. On viewing through the polaroid we find that when the polariod is given one complete rotation about the direction of the light, one of the following is observed
|
(a) The intensity of light gradually decreases to zero and remains at zero |
|
(b) The intensity of light gradually increases to a maximum and remains at maximum |
|
(c) There is no change in intensity |
|
(d) The intensity of light is twice maximum and twice zero |
A bar magnet A of magnetic moment MA is found to oscillate at a frequency twice that of magnet B of magnetic moment MB when placed in a vibrating magneto-meter. We may say that
|
(a) |
(b) |
(c) |
(d) |
The particles which can be added to the nucleus of an atom without changing its chemical properties are called
|
(a) Electrons |
(b) Protons |
(c) Neutrons |
(d) None of the above |
A short magnet of moment 6.75 Am2 produces a neutral point on its axis. If horizontal component of earth's magnetic field is 5
, then the distance of the neutral point should be
| (a) 10 cm | (b) 20 cm | (c) 30 cm | (d) 40 cm |
Two spheres of radius a and b respectively are charged and joined by a wire. The ratio of electric field of the spheres is
|
(a) a/b |
(b) b/a |
(c) |
(d) |
A magnetic needle suspended horizontally by an unspun silk fibre, oscillates in the horizontal plane because of the restoring force originating mainly from
| (a) The torsion of the silk fibre |
| (b) The force of gravity |
|
(c) The horizontal component of earth's magnetic field |
| (d) All the above factors |
Light travels through a glass plate of thickness t and having refractive index n. If c is the velocity of light in vacuum, the time taken by the light to travel this thickness of glass is
|
(a) |
(b) tnc |
(c) |
(d) |