Calculate torque acting on a bar magnet of length 20 cm magnetic dipole moment `4 xx 10^(-6) Am^(2)` , which is placed in earth's magnetic field of flux density ` 2 xx 10^(-5) T` , perpendicular to the field .

Explanation

To calculate the torque acting on a bar magnet placed in a magnetic field, we can use the formula:

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

where:
- \(\tau\) is the torque,
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