Question

An electric current is flowing in the same direction in two coaxial coils. On increasing distance between the two coils the value of current will

• A. decrease
• B. increase
• C. remain unchanged
• D. nothing can be said.

Answer 1

The correct option is B increase

When the two coils are moved apart, the net flux linking the two coils decreases. By Lenz's law a current would be induced in both the coils that opposes this change. Therefore the induced currents will increase the flux linkage. For increasing the flux linkage, the current in both the coils will increase.