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Cool goIITian

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7 Jan 2012 19:28:52 IST

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magnetic field due to current

Physics

why if the magnetic field "0" on the axisof hallo tube carrying current uniformly distributed on its surface?

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Arjun Virmani

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Joined: 1 Jun 2009

Posts: 1294

8 Jan 2012 03:46:40 IST

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By Ampère's law (which is an extension of Biot-Savart Law) :

Tthe integrated magnetic field around a closed loop is proportional to the electric current passing through the loop (inside the loop).

But if we take a loop inside the hollow tube there will be no current passing through / inside that loop signifying that there will be no mangnetic field around that loop.... until we include the surface in the loop!!

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