Question

A uniform but time varying magnetic field exists in cylindrical region and directed into the paper. If field decreases with time and a positive charge is placed at any point inside the region, then it moves :-

(1)
along 1
(2)
along 2
(3)
along 3
(4)
along 4

Answer 1

The positive charge placed at any point inside the region moves along the arrow 4

• The magnetic field is decreasing in the circuit, the induced electric field should be increasing in loop.

• The increase in induced emf in the loop produces current which flows in clock-wise direction.

• If a positive particle is placed at any point it also will move in clockwise direction i.e., along the direction of arrow 4.