Question

When the flux linked with a coil changes :

• A. current is always induced
• B. an emf and a current are always induced
• C. an emf is induced but a current is never induced
• D. an emf is always induced and a current is induced when the coil is a closed one

Answer 1

The correct option is D an emf is always induced and a current is induced when the coil is a closed one

$EMF=-\frac{d\varphi }{dt}$, where $\varphi$ is flux
So, whenever flux changes, EMF is induced. But ,current will be induced only when the coil is a closed one.