Question

A circular metallic loop is kept above the wire AB as shown here. What is the direction of induced current produced in the loop, if any, when the current flowing in the straight wire
(i) is steady, i.e., does not vary.
(ii) is increasing in magnitude. 

justify your answer in each case.

Answer 1

(i) No induced current will be produced in the loop since the constant current flowing in the straight wire produces a constant magnetic field. Hence no induced current is produced in the loop.
(ii) Since current in the straight wire is changing, the magnetic flux associated with the loop will change and hence induced current will be produced in it.
Applying Fleming's Right Hand Rule, the current flowing in the loop will be in clockwise direction.