Physics
Grade-10
Easy
Question
An electric motor is based on the phenomenon of:
- Heating effect of electric current
- Electromagnetic induction
- Magnetic effect of electric current
- Chemical effect of electric current
Hint:
An electric motor works on the principle that when a rectangular coil is placed in a magnetic field and current is passed through it
The correct answer is: Magnetic effect of electric current
- The principle of electromagnetic induction states that when a current carrying conductor is placed in a varying magnetic field, the changing flux induces the electromotive force in the conductor which in turn produces an electric current. Hence, using the principle of electromagnetic induction an electric current is produced in the conductor
- In an electric motor, a rectangular coil is placed between two strong magnets. When an electric current is passed through this rectangular coil, a force acts on the coil and torque is produced. This torque produces the rotational motion in the coil and the rectangular coil rotates continuously until an electric current passes through it.
- Therefore, an electric motor works on the principle that when a rectangular coil is placed in a magnetic field and current is passed through it
- Hence an electric motor utilises the magnetic effect of current.
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