A straight copper rod inside a high-precision electromagnetic actuator has an active length of 15 cm within a magnetic field.
The rod is positioned at right angles to a uniform magnetic field of 0.80 T0.80\text{ T}0.80 T.
During operation, the magnetic force acting on this rod is measured to be 0.18 N.
Calculate the electrical current passing through the rod.
Use an equation from the formula sheet. Give your answer to an appropriate number of significant figures.
10 exam-style questions on Edexcel GCSE Physics 12.3 The motor effect. Each one has a worked solution and a mark scheme showing where the marks go.