Question

The action of an electric motor is based on

• A. Electric current and magnetic effect
• B. Rotation of armature
• C. Both (A) and (B)
• D. None of these

Hint:

The principle of motor action is Fleming’s Left-Hand Rule: thumb = force, forefinger = magnetic field, middle finger = current.

Answer 1

The Correct Option is A

Step 1: Understanding the Concept:
An electric motor converts electrical energy into mechanical energy. Its working principle is based on the interaction of current and magnetic fields.
When current flows through a conductor placed in a magnetic field, a force is exerted on it (Fleming’s left-hand rule).
This force produces rotation in the motor’s armature.
Step 2: Detailed Explanation:
The primary basis of an electric motor is the magnetic effect of current, not just the mechanical rotation of the armature. The rotation is a result, not the principle. Hence, option (A) is correct.
Step 3: Final Answer:
The action of an electric motor is based on Electric current and magnetic effect.