1) a steel wire of lenght l has a magnetic moment M , if the wire is bent in semi-circular arc what would be the moment ans 2M /pie2) calculate the magnetic momemt at a pt on the equator at a distance 20cm from the centre of a magnet of dipole moment 5Am^2 ans :6.25 *10^ -5 wB/m^23)the magnetic induction at a pt P on the axis of a short magnet is equal to magnetic induction at a pt Q on the equatorial line .compare the distances from the centre of the dipole ans : 2^ 1/3 : 14) a short bar magnet of moment of 5Am^2 is placed with its axis in the magnetic meridian and its N -pole facing south ,if the neutral pts are observed at a distace of 10cm form hte centre of the magnet , find Bh . the bar magnet is now reversed now find the neutral pts ans :8 cm from the centre on the equator

Amit Saxena , 11 Years ago

Grade upto college level