Question

The rectangular coil having 100 turns is placed in a uniform magnetic field of `(0.05/sqrt2) hat j` tesla as shown in Fig. 1.84. Find the torque acting on the loop.

Answer 1

The magnetic dipole moment of the current carrying coil is given
by `vecM=NIAhatn`
`=100xx0.5xx0.08xx0.04hati=0.16hatiAm^2`
The torque acting on the coil is
`vectau=vecMxxvecB=M(hatixxhatj)B=1.6xx10^-2xx0.05/(sqrt2)hatk`
`=5.66xx10^-3(Nm)hatk`