Question

The expression for the induced emf contains a negative sign $\left( \xi=-\frac{d\phi}{dt}\right)$. The significance of the negative sign is given by the statement

• A. The induced emf is produced only when the magnetic flux decreases
• B. The induced emf opposes the changes in the magnetic flux
• C. The induced emf is opposite to the direction of the flux
• D. none of the above

Answer 1

Answer: (D)

none of the above

Answer 2

Induced e.m.f. opposes the cause producing it.