Created by StemPy LabWhich closed path round a long straight wire gives a circulation equal to , where is the current in the wire?
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← At a point 4 cm from a long straight wire the field is B. At a second point 12 cm from the wire, the current has been halved. What is the field there?The 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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