A plotting compass is placed near a straight wire. When there is an electric current in the wire, the compass needle deflects.
Which statement explains this deflection?
The wire has its own gravitational field pulling the compass needle.
The wire is made from a magnetic material that always attracts the compass.
The current in the wire creates a magnetic field around the wire.
The current in the wire induces an electrostatic charge on the compass.
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.