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A long cylinder of radius a carrying a u...

A long cylinder of radius a carrying a uniform surface charge rotates about its axis with an angular velocity `omega`.Find the magnetic field energy per unit length of the cylinder.if the linear charge density equals `lambda` and `mu_(r)=1`.

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The correct Answer is:
`(mu_(0)a^(2)omega^(2)lambda^(2))/(8pi)`
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