Question

An inductor is connected to a direct voltage source through a switch. Now

• A. Very large emf is induced in inductor when switch is closed
• B. Larger emf is induced when switch is opened
• C. Large emf is induced whether switch is closed or opened
• D. No emf is induced whether switch is closed or opened

Answer 1

Answer: (D)

As direct voltage doesn't change with time so when current will flow in it the flux of inductor will not change with time. So there will not be any emf induced.
Above statement is true even switch is closed or not.
So in a direct voltage circuit, the inductor behaves like a resistor.