Permanent magnetism Questions

If θ1 and θ2 be the apparent angles of dip observed in two vertical planes at right angles to each other, then the true angle of dip θ is given by :-...

The time period of oscillation of a magnet in vibration magnetometer is 1.5 second. The time period of oscillation of another magnet similar in size, shape and mass but having one fourth magnetic mome...

The magnetic moment of a straight wire of length L is M. If the wire is bent in form of a semicirle then its magnetic moment becomes :-

Magnetic field of earth is 0.3 gauss. A magnet oscillating with rate of 5 oscillation/min. How much the magnetic field of earth is increased, so the number of oscillations become 10 per min:-...

The value of work done for rotating a magnet of magnetic moment M by an angle θ with respect to magnetic field B is given by :-...

For a magnetic needle placed in a uniform magnetic field, which of following are correct :-(a) F ≠ 0, τ ≠ 0 (b) F ≠ 0, τ = 0(c) F = 0, t ≠ 0 (d) F = 0, t = 0...

In sum and difference method of vibration magnetometer, the time period is more, if

At a certain place a magnet makes 30 oscillations per minute. At another place where the magnetic field is double, its time period will be

If the angle of dip at two places are 30o and 45o respectively, then the ratio of horizontal component of earth′s magnetic field at two places will be :-...

At two places A and B using vibration magnetometer, a magnet vibrates in a horizontal plane and its respective time periods are 2 sec and 3 sec and at these places the earths horizontal components are...

Two magnets A and B are identical in mass, length and breadth but have different magnetic moments. In a vibration magnetometer, if the time period of B is twice the time period of A. The ratio of the ...

A bar magnet is held perpendicular to a uniform field. If the couple acting on the magnet is to be halved, by rotating it, the angle by which it is to be rotated is:-...

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 magnetometer. We may say that :-...

A magnetic needle is made to vibrate in uniform field BH, then its time period is T. If it vibrates in the field of intensity 4BH, it time period will be :-...

The vertical component of earth magnetic field is zero at or the earth′s magnetic field always has a vertical component except at the :-

At a certain place, the horizontal component B0 and the vertical component V0 of the earth′s magnetic field are equal in magnitude. The total field at that place will be :-...

Magnetic field lines produced by a bar magnet, cuts

At any place horizontal and vertical component of earth magnetic field are equal then angle of dip at that place :-

Which of the following demonstrated that earth has a magnetic field :-

A bar magnet has a magnetic moment equal to 5 × 10-5 A-m2. It is supended in a magnetic field of 8π × 10-4 T. The magnet vibrates with a period of vibration equal to 15 sec. The moment ...