Suppose the drift velocity $v_d$ in a material varied with the applied electric field $E$ as ${v_d} \propto \sqrt E $. Then $V -I$ graph for a wire made of such a material is best given by
Suppose the drift velocity $v_d$ in a material varied with the applied electric field $E$ as ${v_d} \propto \sqrt E $. Then $V -I$ graph for a wire made of such a material is best given by
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