Drift speed of electrons, when 1.5A of current flows in a copper wire of cross section 5mm2, is v. If the electron density in copper is 9×1028/m3 the value of v in mm/s is close to (Take charge of electron to be =1.6×10−19C)
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The correct option is D0.02 I=neAvd ⇒vd=IneA=1.59×1028×1.6×10−19×5×10−6 =0.02mm/s
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