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2. A long straight wire carries a current of 35 A. What is the magnitude of the field B at a point 20 cm from the wire?
Answers (1)
The magnitude of the magnetic field at a distance r from a long straight wire carrying current I is given by,
In this case
(current=35A, distance= 0.2m, permeability of free space = 4
10-7 TmA-1)
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