Question

Which of the following devices is based on the principle of electromagnetic induction?

• A. Voltmeter
• B. Electric motor
• C. Electric generator
• D. Ammeter

Hint:

An electric generator operates on the principle of electromagnetic induction, where a coil of wire rotates in a magnetic field to produce electricity.

Answer 1

The Correct Option is C

Step 1: Understanding electromagnetic induction.
Electromagnetic induction refers to the process of generating an electromotive force (EMF) by changing the magnetic field within a conductor. This principle is applied in devices like electric generators.
Step 2: Explanation of options.
- (A) Voltmeter: A voltmeter measures the potential difference between two points but does not operate based on electromagnetic induction.
- (B) Electric motor: An electric motor uses magnetic fields to generate motion, but it does not work based on electromagnetic induction; instead, it works on the force created by current in a magnetic field.
- (C) Electric generator: This device generates electricity based on the principle of electromagnetic induction, as it converts mechanical energy into electrical energy by rotating a coil in a magnetic field.
- (D) Ammeter: An ammeter measures the current flowing through a circuit and does not operate based on electromagnetic induction.
Step 3: Conclusion.
An electric generator works based on electromagnetic induction, making it the correct choice.
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