Question

What point is the torque on a loop in a magnetic field taken about?

Answer 1

A magnetic field exerts a force on a straight wire carrying current; it exerts a torque on a loop of wire carrying current. Torque causes an object to spin around a fixed axis. A magnetic field exerts a torque which tries to align the normal vector of a loop of current with the magnetic field.

Answer 2

Hello mate here is your answer.

Motors are the most common application of magnetic force on current-carrying wires. Motors have loops of wire in a magnetic field. When current is passed through the loops, the magnetic field exerts torque on the loops, which rotates a shaft. Electrical energy is converted to mechanical work in the process.

Hope it helps you.