A safety-release mechanism uses the motor effect to move a lightweight catch. In both designs, the straight conductor is at right angles to the magnetic field.
| Design | Magnetic flux density in T | Current in A | Length of conductor inside the field in m |
|---|---|---|---|
| Original | 0.25 | 4.0 | 0.040 |
| Modified | 0.16 | to be calculated | 0.050 |
The force on the conductor must be the same in both designs.
Calculate the current needed in the modified design.
90 exam-style questions on AQA GCSE Physics 7.2 The motor effect, covering 7.2.1 Electromagnetism, 7.2.2 Fleming's left-hand rule (HT only), 7.2.3 Electric motors (HT only), and 7.2.4 Loudspeakers (HT only). Each one has a worked solution and a mark scheme showing where the marks go.