(a) Two straight long parallel conductors carry currents `I_(1)` and `I_(2)` in the same direction. Deduce the expression for the firce per unit length between them.
Depict the pattern of magnetic field lines around them.
(b) A rectangular current carrying loop EFGH is kept in a uniform magnetic field as shown in the figure.
(i) What is the direction of the magnetic moment of the current loop ?
(ii) What is the torque acting on the loop (A) maximum, (B) zero ?