### Step-by-Step Solution:
1. **Understanding the Electric Motor**: An electric motor is a device that converts electrical energy into mechanical energy.
2. **Principle of Operation**: The electric motor operates on the principle of electromagnetism, specifically utilizing the magnetic effect of electric current.
3. **Current-Carrying Coil**: When a rectangular coil (or loop) of wire is placed in a magnetic field and an electric current passes through it, the interaction between the magnetic field and the electric current generates a force.
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