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JEE Main & Advanced Physics Current Electricity, Charging & Discharging Of Capacitors / वर्तमान बिजली, चार्ज और कैपेसिटर का निर Question Bank Self Evaluation Test - Current Electricity

  • question_answer
    The resistance of a wire is R. It is bent at the middle by \[180{}^\circ \] and both the ends are twisted together to make a shorter wire. The resistance of the new wire is copper wire becomes three times its value at \[0{}^\circ C\]?

    A) 2R

    B) R/2

    C) R/4

    D) R/8

    Correct Answer: C

    Solution :

    [c] Resistance of wire (R)\[=\rho \frac{l}{A}\] If wire is bent in the middle then \[l'=\frac{l}{2},A'=2A\]


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