Two wires each of radius of cross section `r` but of different materials are connected together end to end (in series). If the densities of charge charge carries in the two wires are in the ratio `1:4`, the drift velocity of electrons in the two wires will be in the ratio:A. `1:2`B. `2:1`C. `4:1`D. `1:4`

Two wires each of radius of cross section `r` but of different materia

1.	Two wires each of radius of cross section `r` but of different materials are connected together end to end (in series). If the densities of charge charge carries in the two wires are in the ratio `1:4`, the drift velocity of electrons in the two wires will be in the ratio:A. `1:2`B. `2:1`C. `4:1`D. `1:4`
Answer» Correct Answer - C `I=n_(1) eAv_(d_(1))=n_(2)eAv_(d_(2))` `implies (v_(d_(1)))/(v_(d_(2)))=(n_(2))/(n_(1))=4/1`

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