Calculate the moment of couple required to keep a bar magnet of magnetic moment `2 xx10^(2) Am^(2)` a uniform field of induction 0.36 T at an angle of `30^(@)` with the direction of the field.

Explanation

To calculate the moment of couple required to keep a bar magnet in a uniform magnetic field, we can follow these steps:

### Step 1: Understand the formula for torque (moment of couple)
The torque (τ) experienced by a magnetic dipole (bar magnet) in a magnetic field is given by the formula:
\[ \tau = M \cdot B \cdot \sin(\theta) \]
where:
...