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Standard VIII

Physics

Heating Effect of Electric Current

The current d...

Question

The current density across a cylinderical conductor of radius R varies in magnitude according to the equation J=J0 {1-(r/R)} where r is the distance from the central axis. Thus , the current density is maximum J0 at the axis (r=0)and decreases linearly to zero at the surface (r=R). The current in terms of J0 and conductor's cross -sectional area A is :- (1){(J0)A/3} (2){(J0)A/6} (3){(J0)A/2} (4){(J0)A/5

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