The force on a current-carrying wire in a magnetic field is 0.40 N.
The current is doubled, the length of wire in the field is halved and the magnetic flux density is made three times larger.
What is the new force on the wire?
2.4 N2.4\ \text{N}2.4 N
0.60 N0.60\ \text{N}0.60 N
0.27 N0.27\ \text{N}0.27 N
1.2 N1.2\ \text{N}1.2 N
48 exam-style questions on OCR GCSE Physics 4.2 Uses of magnetism, covering 4.2.1 The motor effect, 4.2.2 Fleming's left-hand rule, 4.2.3 The force on a current-carrying conductor, 4.2.4 The electric motor, 4.2.5 Electromagnetic induction, 4.2.6 Alternators and dynamos, 4.2.7 How transformers work, 4.2.8 Transformer turns ratio, 4.2.9 Potential differences and turns in transformers, and 4.2.10 Microphones, loudspeakers and headphones. Each one has a worked solution and a mark scheme showing where the marks go.