1.

Suppose drift velocity over the entire cross section of a wire isV (r) = V_(0) [ 1 - (r)/(R) ] . What is the current density at the surface of the wire ?

Answer»

zero
`V_(0)`R
ne`V_(0)`
ne`(r)/(R)`

Solution :zero
`V_(r) = V_(0) [ 1 - (r)/(R) ] ` on the surface , taking r = R.
`therefore V_((r))= V_(0) [ 1- 1 ] `
`therefore V_((r)) = V_(0) [0] =0 `


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