Teaching BPSC 4.0 बिहार उच्च माध्यमिक शिक्षक भर्ती (PGT) Mock Test Physics Moving Charges and Magnetism The Magnetic Dipole Moment
The magnetic field strength of a bar magnet at a point P along its axial line is B. If the distance between the centre of the magnet and point P is halved, the new magnetic field strength at P is B'. find the relation between B and B'.
1
2 B' = B
2
B' = B
3
B' = 4 B
4
B' = 8 B
5
None of the above/More than one of the above.