Created by StemPy LabThe turns of a long solenoid are pulled apart evenly, so that the same number of turns now covers twice the length. The current is the same. What happens to the field in the middle?
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← Which closed path round a long straight wire gives a circulation oint B· dl equal to µ₀ I, where I is the current in the wire?A doughnut-shaped winding of 700 turns is carrying 2.5 A. A probe inside the ring sits on a circle of radius 14 cm about the centre of the ring, which runs round the ring. What field does the probe read? →
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