A copper ring is dropped vertically downwards through a horizontal magnetic field. As the ring enters the magnetic field, an induced current is set up in it. This induced current interacts with the magnetic field to produce a force on the ring. In which direction is this force?
in the direction of the gravitational pull (downwards)
in the direction of the magnetic field lines
in the opposite direction to the magnetic field lines
in the opposite direction to the movement of the ring (upwards)
275 exam-style questions on CIE IGCSE Physics 4.5 Electromagnetic effects, covering 4.5.1a Electromagnetic induction, 4.5.1b Direction of an induced e.m.f., 4.5.2 The a.c. generator, 4.5.3a Magnetic effect of a current and its applications, 4.5.3b Strength and direction of the field around wires and solenoids, 4.5.4a Force on a current-carrying conductor, 4.5.4b Force on beams of charged particles, 4.5.5 The d.c. motor, 4.5.6a Construction and operation of a transformer, 4.5.6b Turns ratio and current in a transformer, and 4.5.6c High-voltage transmission of electricity. Each one has a worked solution and a mark scheme showing where the marks go.