In a haptic actuator designed for a high-precision surgical simulation glove, a micro-coil of wire is positioned within a uniform magnetic field oriented perpendicular to the direction of the current.
When a control current of 120 mA120\text{ mA}120 mA passes through the coil, a magnetic force of 0.072 N0.072\text{ N}0.072 N is generated to simulate tactile resistance.
The total active length of the wire forming the coil within the magnetic field is 2.5 m2.5\text{ m}2.5 m.
Calculate the magnetic flux density of the field, providing your answer to 2 significant figures.
13 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.