Question
Mon December 31, 2012 By: Akshaybajpai

a current is set up in a copper pipe. is there a magnetic field (1)inside (2)outside. give reason also

Expert Reply
Mon December 31, 2012
1)The magnetic field is zero inside the pipe.
2) A finite magnetic field exists outside the pipe.
outside the pipe,B = ?0I/2?r
magnetic field is inversely proportional to r. where r is distance from the axis.
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