A uniform wire of diameter d carries a current of 100 mA when the mean drift velocity of electrons in the wire is v . For a wire of diameter 2 d of the same material to carry a current of 200 mA , t

Question

A uniform wire of diameter d carries a current of 100 mA when the mean drift velocity of electrons in the wire is v . For a wire of diameter 2 d ​ of the same material to carry a current of 200 mA , the mean drift velocity of electrons in the wire isNEET 2024 (Re-NEET)

TestHub · Accepted Answer

current i = n A v d ​ e ( v d ​ = mean drift velocity ) = n ( 4 π D 2 ​ ) v d ​ e ∴ i ∝ D 2 v d ​ 200 100 ​ = ( 2 d ​ ) 2 ( d ) 2 ​ × v ′ v ​ ⇒ v ′ = 2 × 2 2 v = 8 v

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