A cylindrical conductor of diameter 0.1 mm carries a current of 90 ma. The current density (in A `m^(-2)`) is `(pi~~3)`

A cylindrical conductor of diameter 0.1 mm carries a current of 90 mA. The current density( in Am^(-2) ) is pi= 3

A uniform straight conductor of radius 0.25 mm carries a steady current of 2A .Calculate the current density in it.

A copper conductor of area of cross- section 40 mm^(2) on a side carries a constant current of 32 xx 10^(-6)A . Then the current density is (in amp//m^(2) )

A conductor carries a current of 3 mA. The number of electrons passing through it in 1 minute is about