Question

The magnitude of the induced emf in a circuit is equal to the time rate of change of magnetic flux through the circuit, is statement of

• A. Fleming's right hand rule
• B. Fleming's left hand rule
• C. Newton's third law
• D. Faraday's law of electromagnetic induction

Answer 1

Answer: (D)

The magnitude of the induced emf in a circuit is equal to the time rate of change of magnetic flux through the circuit. Mathematically, the induced emf is given by
$\epsilon =-\frac{d{\varphi }_B}{dt}$
The negative sign indicates the direction of $\epsilon$ and hence the direction of current in a closed loop.
This is statement of Faraday's law of electromagnetic induction. Fleming's rules, Newton's third law deal with forces and their directions.