2. Questions Bank
  3. JEE Main & Advanced
  4. Physics
  5. Current Electricity, Charging & Discharging Of Capacitors / वर्तमान बिजली, चार्ज और कैपेसिटर का निर

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 20 ohms. It is so stretched that the length becomes three times, then the new resistance of the wire will be                                                      [MP PET 1989]

    A)                    6.67 ohms                      

    B)            60.0 ohms

    C)                    120 ohms                       

    D)            180.0 ohms

    Correct Answer: D

    Solution :

                 In case of stretching of wire                                                                                    \[R\propto {{l}^{2}}\] \[\Rightarrow \] If length becomes 3 times so Resistance becomes 9 times i.e.                                                                          \[R'=9\times 20=180\Omega\]


You need to login to perform this action.
You will be redirected in 3 sec spinner