A bar magnet when placed at an angle of $30^\circ $ to the direction of magnetic field induction of $5 \times {10^{ - 2}}{\rm{\;T}},$ experiences a moment of couple $25 \times {10^{ - 6}}{\rm{\;N}} - {\rm{m}}.$ If the length of the magnet is 5 cm, its pole strength is

JEE PHYSICS MCQ: MAGNETISM AND MATTER

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Application +4 | -1

A bar magnet when placed at an angle of

30^\circ

to the direction of magnetic field induction of

5 \times {10^{ - 2}}\mathrm{\;T},

experiences a moment of couple

25 \times {10^{ - 6}}\mathrm{\;N} - \mathrm{m}.

If the length of the magnet is 5 cm, its pole strength is

View answer and explanation

Correct option: A

2 \times {10^{ - 2}}

A-m

Option A (

2 \times {10^{ - 2}}

A-m) is correct because it is the pole strength calculated using the torque equation for a magnet in a magnetic field.

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