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The current density in a cylindrical con...

The current density in a cylindrical conductor of radius R varies according to the equation `J=J_(0)(1-r/R)`, where r=distacnce from the axis. Thus the current density is a maximum `J_(0)` ata the axis r=0 and decreases linealy to zero at the surface `R=2/sqrtpi`. Current in terms of `J_(0)` is given by `n(J_(0)/6)` then value of n will be.

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`J_(0)A//3`,
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