A student is doing an experiment on the magnetic force experienced by a current-carrying wire in a uniform magnetic field. The magnetic flux density B B\,B can be varied.
For a particular flux density, the current in the wire is 2.5 A. The length of the wire in the field is 0.16 m. The angle between the current and the magnetic field is 30∘30^\circ30∘. The force experienced by the wire is 7.0 × 10-2 N.
The student calculates B B\,B and records the results in a table.
Which row shows the correct table heading for B B\,B and the correct value for BBB?
Heading: B/TB/\text{T}B/T; Value: 0.200.200.20
Heading: B/TB/\text{T}B/T; Value: 0.350.350.35
Heading: B/WbB/\text{Wb}B/Wb; Value: 0.200.200.20
Heading: B/WbB/\text{Wb}B/Wb; Value: 0.350.350.35
34 exam-style questions on OCR A A Level Physics Electromagnetism, covering Magnetic fields, Motion of charged particles, and Electromagnetism. Each one has a worked solution and a mark scheme showing where the marks go.