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A long copper tube of inner radius R cam...

A long copper tube of inner radius R camies a cumet i The magnetic feld Biside the tube is

Text Solution

Verified by Experts

The correct Answer is:
4
`W_(g)+W_(mg)+W_("friction")=/_\KE`
`W_("friction")=0-1/2m[(qBR)/m]^(2)`
`W_("friction")=-1/2(q^(2)B^(2)R^(2))/m=(-Kq^(2)B^(2)R^(2))/(8m)`
`K=4`
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