An automated sorting chute in a recycling facility uses a solenoid to pull a pivoting diverter arm against a tension spring. When activated, the magnetic field pulls a cylindrical plunger into the coil.
Explain why the plunger must be made of soft iron rather than aluminium.
When the solenoid is energized, a magnetic force of 5.85 N5.85\text{ N}5.85 N is applied to the plunger, extending the spring by 1.30 cm1.30\text{ cm}1.30 cm. Calculate the spring constant of the tension spring in N/m\text{N/m}N/m.
State two modifications to the solenoid or its electrical circuit that would increase the magnetic force on the plunger.
The motor effect Questions
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.