JEE Main & Advanced Physics Current Electricity, Charging & Discharging Of Capacitors / वर्तमान बिजली, चार्ज और कैपेसिटर का निर Question Bank Electric Conduction Ohms and Resistance

  • question_answer
    The resistance of a wire is R. If the length of the wire is doubled by stretching, then the new resistance will be [Roorkee 1992; AFMC 1995; KCET 1993; AMU (Med.) 1999; CBSE PMT 1999; MP PET 2001; UPSEAT 2001]

    A)                    2R

    B)                                      4R

    C)                    R                                        

    D)            \[\frac{R}{4}\]

    Correct Answer: B

    Solution :

                 \[R\propto {{l}^{2}}\] Þ If l doubled then R becomes 4 times.


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