Two circular coils are placed adjacent to each other. Their planes are parallel and currents through them `i_1` and `i_2` are in same direction. Choose the correct options.

Options

A. when A is brought near B, current `i_2` will decrease
B. in the above process current `i_2` will increase
C. when current `i_1` is increased, current `i_2` will decrease
D. in the above process current `i_2` will increase

Answer

A, C

Explanation

According to Lenz's law, induced effect always oppose the changge `i_1` and `i_2` both are in same direction. Hence, magnetic lines from B due to both currents are from right to left. By bringing `A` closer to B or increasing `i_1` right to left magnetic field from B will increase. So, `i_2` should decrease.