A student sets up an experiment where a straight conductor is suspended between the poles of a strong magnet. The conductor is connected in series to a DC power source and a switch.
Explain what happens to the conductor when the switch is closed, describing the magnetic interactions involved.
A section of the conductor of length 0.30 m0.30\text{ m}0.30 m is situated at right angles to a uniform magnetic field of magnetic flux density 0.080 T0.080\text{ T}0.080 T. When the switch is closed, the conductor experiences a magnetic force of 0.060 N0.060\text{ N}0.060 N. Calculate the current flowing through the conductor. Use the equation: \
F = B I l{\char"24}$16 exam-style questions on OCR GCSE Physics Uses of magnetism. Each one has a worked solution and a mark scheme showing where the marks go.