Question

According to which law 'Induced emf generated in a closed loop is equal to the rate of change of magnetic flux passing through it' ?

• A. Coulomb's law
• B. Lenz's law
• C. Newton's law
• D. Faraday's law

Answer 1

The Correct Option is D

To solve the problem, we need to identify the law which states that the induced emf in a closed loop is equal to the rate of change of magnetic flux through the loop.

1. Understanding Faraday's Law of Electromagnetic Induction:
According to Faraday's Law, the magnitude of the induced emf in a closed circuit is directly proportional to the rate of change of magnetic flux through the circuit.

Mathematically:
\[ \text{emf} = -\frac{d\Phi_B}{dt} \] where \( \Phi_B \) is the magnetic flux.

2. Distinguishing from Other Laws:
- Coulomb’s Law deals with electric force between charges.
- Lenz’s Law gives the direction of the induced current (negative sign in Faraday’s law).
- Newton’s Laws are laws of motion.

Final Answer:
The correct law is \({\text{Faraday's law}} \).