A square loop of side l is kept in a uniform magnetic field B such that its plane makes an angle 'a' with B . The loop carries a current i. The torque experienced by the loop in this position is ?
a) Bil2
b) Bil2cosa
c) Bil2sina
d) Zero
Please tell how to take angle in these kind of questions

(b) option is correct.
Since plane makes an angle a with the magnetic field, therefore area makes an angle (90-a) with the magnetic field.

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