In a high-precision optical focusing actuator of a microscope, a coil of wire is suspended within a uniform, radial magnetic field.
When a control current of 16 mA is passed through the coil, a magnetic force of 0.054 N is generated to shift the focusing lens.
The total length of the wire that constitutes the coil is 7.5 m.
Calculate the magnetic flux density of the field surrounding the coil, giving your answer to 2 significant figures.
Practise AQA GCSE Physics The motor effect with exam-style questions for Foundation and Higher tier. 25 questions covering Electromagnetism, Fleming's left-hand rule (HT only), Electric motors (HT only), and Loudspeakers (physics only) (HT only), matched to the AQA GCSE Physics (8463) specification and written in Paper 1 and Paper 2 style. Every question includes a full worked solution and mark scheme, so you can see where marks are awarded rather than just whether you got the answer right.