Question

A current carrying loop in a uniform magnetic field will experience

• A. force only
• B. torque only
• C. both torque and force
• D. neither torque nor force

Answer 1

Answer: (B)

torque only

A current carrying loop in a uniform magnetic field will experience torque only given by
$\overrightarrow{\tau }=\overrightarrow{M}\times \overrightarrow{B}$
Where M is magnetic moment of loop B is magnetic field.
Force is zero on a current carrying loop in a uniform magnetic field.
Note : Magnetic field must be uniform for net force to be zero.
For a non uniform field, net force may not be zero