In the given figure, the north pole of a magnet is brought towards a closed loop containing a condenser. Positive charge will be produced on

As north pole is moving towards the coil, current in the coil induce such a way that it opposes the motion of the north pole i.e. an anticlockwise current will develop in the coil so that it behaves as north pole and repel the magnet. If current induced is anticlockwise electron will move from A to B hence A will be positive.