A straight copper wire is placed at right angles to a uniform magnetic field between two magnetic poles.
The wire is 0.250 m long within the field and carries a current of 75.0 mA.
The magnetic force exerted on the wire is 4.50 × 10-4 N.
Calculate the magnetic flux density of the magnetic field.
Use the equation:
F=B×I×l F = B \times I \times l F=B×I×l10 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.