A horizontal, straight wire carrying 12.0 A current from west to east is in the earth’s
magnetic field B. At this place, B is parallel to the surface of the earth, points to the
north and its magnitude is 0.04 mT. Determine the magnetic force on 1 m length of
the wire. If mass of this length of wire is 50 g, calculate the value of current in the
wire so that its weight is balanced by the magnetic force.
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