Two cells with same e.m.f. ‘E’ and different internal resistances r1 and r2 are connected in series to an external resistance ‘R’. The value of R so that the p.d. across the first cell be zero is

Two cells with same e.m.f. ‘E’ and different internal resistances r1 and r2 are connected in series to an external resistance ‘R’. The value of R so that the p.d. across the first cell be zero is

  1. A

    r1r2

  2. B

    r1+r2

  3. C

    r1r2

  4. D

    r1+r22

    Register to Get Free Mock Test and Study Material



    +91



    Live ClassesRecorded ClassesTest SeriesSelf Learning

    Verify OTP Code (required)

    I agree to the terms and conditions and privacy policy.

    Solution:

    i=E1+E2R+r1+r2=2ER+r1+r2;V1=E1ir1=0i=Er1=2ER+r1+r2;R+r1+r2=2r1R=r1r2

    Chat on WhatsApp Call Infinity Learn

      Talk to our academic expert!



      +91



      Live ClassesRecorded ClassesTest SeriesSelf Learning

      Verify OTP Code (required)

      I agree to the terms and conditions and privacy policy.