A rectangular coil PQRS is mounted on an axle between the poles of a permanent magnet and connected to a battery through a split-ring commutator.
Answer the following questions related to its operation.
a. (i) State Fleming’s left-hand rule.
b. (ii) Explain, step by step, how a continuous unidirectional torque is produced on the coil during one complete rotation.
c. (iii) Why is a soft iron core often placed inside the coil? Give reason.