Q5 of 54 Page 277

To measure the magnetic moment of a bar magnet, one may use

A deflection or oscillation galvanometer can be used to know the magnetic moment of a bar magnet. For a deflection magnetometer, the formula to calculate moment is



And for a vibrational magnetometer is



Where, M is the magnetic moment, is the horizontal magnetic field, T is the time period.


Combining both equations, we can get rid of . Hence, B, C and D are true.

More from this chapter

All 54 →
3

Consider a magnetic dipole kept in the north to south direction. Let P1, P2, Q1, Q2 be four points at the same distance from the dipole towards north, south, east and west of the dipole respectively. The directions of the magnetic field due to the dipole are the same at

 4

Consider the situation of the previous problem. The directions of the magnetic field due to the dipole are opposite at

 1

A long bar magnet has a pole strength of 10 Am. Find the magnetic field at a point on the axis of the magnet at a distance of 5 cm from the north pole of the magnet.

 2

Two long bar magnets are placed with their axes coinciding in such a way that the north pole of the first magnet is 2.0 cm from the south pole of the second. If both the magnets have a pole strength of 10 Am, find the force exerted by one magnet on the other.