A circular loop carrting a current a current I has wire of total length L. A uniform umagnetic field B exists parallel to the plane of the loop. (a ) find the trouque on the loop.(b) If the sme length of the wire is used to form a squar loop, what would be the torque? Which is larger?

Explanation

To solve the problem, we will break it down into two parts as specified in the question.

### Part (a): Finding the Torque on the Circular Loop

1. **Identify the Length of the Circular Loop**:
The total length of the wire used to form the circular loop is given as \( L \). The circumference of a circular loop is given by:
\[
L = 2\pi R
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