A horizontal wire of length 0.60 m0.60\text{ m}0.60 m and weight 1.5 N1.5\text{ N}1.5 N is placed in a uniform horizontal magnetic field of flux density 2.0 T2.0\text{ T}2.0 T directed at 90∘90^\circ90∘ to the wire.
What is the current that just supports the wire?
0.80 A0.80\text{ A}0.80 A
1.25 A1.25\text{ A}1.25 A
1.80 A1.80\text{ A}1.80 A
3.00 A3.00\text{ A}3.00 A
66 exam-style questions on AQA A Level Physics Magnetic fields (A-level only), covering Magnetic flux density (A-level only), Moving charges in a magnetic field (A-level only), Magnetic flux and flux linkage (A-level only), Electromagnetic induction (A-level only), Alternating currents (A-level only), and The operation of a transformer (A-level only). Each one has a worked solution and a mark scheme showing where the marks go.