Drift speed Time needed to drift through 5 cm is 11 123 t j ne 1 106 A m 8 6 x 1028 1 6 x V 5 x 10 mv 2 1 2 3 7 2 x 10 5 The

Question

Drift speed Time needed to drift through 5 cm is 11 123 t j ne 1 106 A m 8 6 x 1028 1 6 x V 5 x 10 mv 2 1 2 3 7 2 x 10 5 The thermal kinetic energy of electrons is of the order of 13 12 KT where K 1 38 x 10 23 J constant KT 3 KT m 5 695 S Distance travelled by electron in t 695 s is 10 19 1 17 x 105 ms 7 2 x 10 5 ms 23 3 x 1 38 x 102 300 9 1 10 31 S vt 1 17 x 105 695 m 8 1 x 104 km Q 48 A copper wire of length 5 cm carries a current of density j 1 A mm 2 The density and molar mass of copper are 9000 Kg m3 and 63 gmol Each copper atom contributes one free electron The temperature of the wire is 27 C Estimate the average distance travelled by a free electron during the time it moves from one end of the

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