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    Question

    Two wires of identical radius of cross-section rrr, but

    made of different materials, are joined end-to-end (i.e., in series). If the number density of free electrons (charge carriers) in the two wires is in the ratio 2:5, what will be the ratio of the drift velocities of electrons in the two wires?
    A 5:2 Correct Answer Incorrect Answer
    B 2:5 Correct Answer Incorrect Answer
    C 5:4 Correct Answer Incorrect Answer
    D 4:5 Correct Answer Incorrect Answer

    Solution

    When two wires are connected in series , the current I flowing through both wires is the same . From the relation of current and drift velocity:

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