One long straight wire is to be held directly above another by repulsion between their currents. The lower wire carries 100 A and the wire 7.50 cm above it is 10-gauge (2.588 mm diameter) copper wire.                                    (a) What current must flow in the upper wire, neglecting the Earth’s field?      (b) What is the smallest current if the Earth’s 3.00×10−5 T field is parallel to the ground and is not neglected?                                                                    (c) Is the supported wire in a stable or unstable equilibrium if displaced vertically? If displaced horizontally?

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Magnetic Force

A magnetic force arises when a charged particle or a current-carrying conductor is placed in a magnetic field. It is created because of the movement of the charged particles.