Experiment 4 — Make the Coil Spin

Topic: Physics · Class 10 · Magnetic effects of current: the electric motor

Aim: Make the coil rotate continuously in one direction.

Daily: Fans, mixers, pumps, washing machines, electric scooters and hard drives all contain this same arrangement: a current-carrying coil turning inside a magnetic field.

Question: What is the job of the split-ring commutator in a motor?

Exp: Without it, the coil would stop after half a rotation.

Question: Fleming’s left-hand rule is used for…

Exp: The right-hand rule is for induced current.

Question: The force on a current-carrying wire is greatest when the wire is…

Exp: At right angles the force is maximum.

Question: Reversing the current in a motor…

Exp: So does reversing the magnetic field.

Question: A soft iron core is used in a motor coil to…

Exp: It concentrates the field and increases the force.