A rectangular coil of 100 turns has length 5 cm and width 4 cm. it is placed with its plane parallel to a uniform magnetic field and a current of 2 A is sent through the coil. Find the magnitude of the magnetic field B, if the torque acting on the coil is `0.2 Nm^(-1).`

Explanation

To solve the problem step by step, we will use the formula for torque acting on a rectangular coil in a magnetic field. The torque (τ) on a coil is given by the formula:

\[ \tau = n \cdot B \cdot I \cdot A \cdot \sin(\theta) \]

Where:
- \( \tau \) = Torque (in Nm)
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