A uniform magnetic field \(\vec{B}\) is established along the positive z-direction. A rectangular loop of sides 'a' and 'b' carries a current of I as shown in figure. The torque in the loop is:
Answer & explanation
Correct answer: option 1
$ \vec{\tau} = NI\vec{A}\times\vec{B} = I ab\hat{i} \times B\hat{k}$
$\Rightarrow \vec{\tau } = IabB (-\hat{j})$