For which of the following dependence of drift velocity $v$ on electric field $E$ is ohm's law obeyed
A$v\, \propto \,E$
B$v =$ constant
C$v\, \propto \,E^{1/2}$
D$v\, \propto \,E^2$
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A$v\, \propto \,E$
a ${v_d}\, = \,\frac{{eE}}{m}\tau \,\, \Rightarrow \,{v_d}\, \propto \,E$
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