Supposed a wire is directly fused to a thinner wire of the s

Supposed a wire is directly fused to a thinner wire of the same material which has only half the cross-sectional area. If the drift speed is the thick wire is 4 times 10^-5 m/s, what is the drift speed in the thinner wire? 16 times 10^-5 m/s 8 times 10^-5 m/s 4 times 10^-5 m/s 2 times 10^-5 m/s 1 imes 10^-5 m/s

Solution

drift speed v ₂ in the thinner wire = ½ x 4 x10 ^-5    = 2 x10 ^-5    

option    : D