A bar magnet of length 0.2m placed in a uniform magnetic field of induction `15 Wbm^(-2)`, with its axis at `30^(@)` to the field experience a couple of 7.5 N-m. Find the pole strength of the bar magnet.

Explanation

To find the pole strength of the bar magnet, we can use the formula for the torque (couple) experienced by a bar magnet in a magnetic field. The torque (τ) is given by the equation:

\[ \tau = m \cdot B \cdot L \cdot \sin(\theta) \]

Where:
- \( \tau \) = Torque (N·m)
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