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
    An electric wire of length ?I? and area of cross-section \[a\] has a resistance R ohms. Another wire of the same material having same length and area of cross-section 4a has a resistance of                                         [MP PMT 1993]

    A)                    4R                                     

    B)            R/4

    C)                    R/16                                 

    D)            16R

    Correct Answer: B

    Solution :

                 \[R=\frac{\rho l}{a}\] for first wire and R?=\[\frac{\rho l}{4a}=\frac{R}{4}\]for second wire.


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