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MHT CET202019 Oct 2020Evening ShiftPhysicsCurrent ElectricityActual

Two cells having unknown e.m.f.s E ₁ and E ₂ ( E ₁> E ₂ ) are connected in potentiometer circuit so as to assist each other. The null point obtained is at 490 cm from the higher potential end. When cell E ₂ is connected so as to oppose cell E ₁ , Ithe null point is obtained at 90 ~cm from the same end. The ratio of the e.m.f.s of two cells ( E ₁ E ₂ ) is

Options

  1. A0.689
  2. B0 182
  3. C5 33
  4. D1 45

Correct answer

D. 1 45

Step-by-step solution

(A) aligned E₁ E₂ &= ₁+ ₂ ₁- ₂ &= 490+90 490-90 = 580 400 =1.45 aligned

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