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NCERT Class XII Chapter
Magnetism and Matter
Questions With Solutions

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Question : 21
Total: 25
A magnetic dipole is under the influence of two magnetic fields. The angle between the field directions is 60°, and one of the fields has a magnitude of 1.2 × 10–2 T. If the dipole comes to stable equilibrium at an angle of 15° with this field, what is the magnitude of the other field?
Solution:  

The magnetic dipole experiences torque due to both the fields and is in equilibrium.
MB1 sin15° = MB2 sin45°
1.2 × 10–2 × 0.26 = B2 (0.71)
or B2 = 0.44 × 10–2 T.
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