Thank you for reporting, we will resolve it shortly
Q.
Torque acting on a rectangular coil carrying current $'I'$ situated parallel to magnetic field of induction $'B'$ having number of turns $'n'$ and area $'A'$ is
When a current carrying coil is placed in a magnetic field, the coil experienced a torque given by
$ \tau=M \times B $
where, $M=$ magnetic moment $=n i A$
$\therefore \,\,\,\,\, \tau=n i(A \times B)$
where, $n=$ number of turns,
$i=$ current flowing in coil
and $A= $ area of coil