A student places a small compass near a copper wire. When an electric current is passed through the wire, the compass needle deflects. Which statement explains why this deflection occurs?
The current in the wire creates a gravitational field that attracts the compass needle.
The copper wire is a permanent magnetic material that only attracts the compass needle when heated.
The electric current in the wire creates a magnetic field that exerts a force on the compass needle.
The current in the wire induces a static electric charge on the compass needle.
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.