A rectangular coil 60mm × 40mm with 25 turns is positioned with its longer sides parallel to a long straight vertical wire carrying a current of 6.8A. The coil is placed so that its long sides and the vertical wire are in the same vertical plane, with the wire 40mm away from the nearest long side of the coil. A current of of 2.0A is passed round the coil.
(a). Calculate the force on each long side of the coil due to the magnetic field created by the vertical wire.
(b). Explain why the top and bottom sides of the coil experience equal and opposite forces.
(c). Calculate the overall force on the coil.
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