The correct option is
D The current will reverse its direction as the electron goes past the loop.
As Electron passes along straight line
AB, its flow is not continous, hence instead of a current carrying wire it will behave like a small current element.
⇒direction of small current
dI is from
B→A, the magnetic field at centre of loop
(B) due to current element will be perpendicularly inwards to the plane.
∵B∝1r2, from biot-savart law.
⇒As electron approaches loop,
(A→O),
r↓ and the
B at centre of loop
↑, hence current induced in ANTICLOCKWISE direction to oppose it.
Similarly,
⇒As electron goes past the loop,
(O→B),
r↑ and the
B at centre of loop
↓, hence current induced in CLOCKWISE direction to oppose it.