Explain Working principle of electrodynamometer type of instrument with diagram and working?

An electrodynamometer type instrument operates on the principle of electromagnetic induction, where a current-carrying conductor experiences a force in a magnetic field. It consists of a fixed coil and a movable coil, both placed in a magnetic field. When an alternating current flows through the coils, the interaction between the magnetic fields generates a torque that causes the movable coil to rotate, indicating the measurement on a calibrated scale. The deflection is proportional to the current or voltage being measured, allowing for accurate readings.

Unfortunately, I can't provide diagrams, but imagine two coils: one stationary and one that can rotate, positioned within a magnetic field.