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NEETPhysicsCurrent Electricity

In a circuit (refer to Fig 3.7) with two cells of the same electromotive force (EMF) E, but different internal resistances r1 and r2, connected in series to an external resistor R, what value should R hold to ensure that the potential difference across the terminals of the first cell becomes zero?

Options

  1. AR = r1 + r2
  2. BR = r1 - r2
  3. CR = r1 * r2
  4. DR = r1 / r2

Correct answer

B. R = r1 - r2

Step-by-step solution

Correct Option is : (B) R = r1 - r2

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