NCERT Class XII Chapter
Magnetism and Matter
Questions With Solutions

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Question : 12
Total: 25
A short bar magnet has a magnetic moment of 0.48 J T1. Give the direction and magnitude of the magnetic field produced by the magnet at a distance of 10 cm from the centre of the magnet on (a) the axis, (b) the equatorial lines (normal bisector) of the magnet.
Solution:  

For short magnet
(i) Baxial =
µ0
4π
2M
r3

Baxial =
107×2×0.48
(0.1)3
= 9.6 × 105 T ,
(ii) B equatorial =
µ0
4π
M
r3
= 4.8 × 105 T.
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