NEET Physics: Questions 582 - 586 of 2099
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Question number: 582
Question number: 583
A compass needle when placed on the magnetic north pole of the earth cannot rotate in vertical direction.
The earth has only horizontal component of its magnetic field at the north poles.
|a.||Ꭺ is false but Ꭱ is true|
|b.||Both Ꭺ and Ꭱ are true and Ꭱ is the correct explanation of Ꭺ|
|c.||Ꭺ is true but Ꭱ is false|
|d.||Both Ꭺ and Ꭱ are true but Ꭱ is NOT the correct explanation of Ꭺ|
Question number: 584
A short magnet of length 4 cm is kept at a distance of 20 cm to the east of a compass box such that is axis is perpendicular to the magnetic meridian. If the deflection produced is 45°, find the pole strength (H = 30 Am -1)
Question number: 585
A north pole of strength 50 Am and South Pole of strength 100 Am are separated by a distance of 10 cm in air. Find the force between them.
20 x 10 -6 N
25 x 10 -3 N
30 x 10 -18 N
50 x 10 -3 N
Question number: 586
When a small piece of wire passes between the magnetic poles of a horse-shoe magnet in 0.1 sec, emf of 4 x 10 -3 volt is induced in it. The magnetic flux between the poles is,
4 x 10 -3 weber
4 x l0 -4 weber
4 x 10 -6 weber
4 x l0 -2 weber