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NEET2026PhysicsChapterActual

A battery with an electromotive force of 6.0 V is connected to an external circuit. When a steady current of 2.0 A is drawn from it, the potential difference across the battery terminals is measured to be 5.4 V. The internal resistance of the battery is :

Options

  1. A0.3
  2. B1.2
  3. C2.7
  4. D3.0

Correct answer

A. 0.3

Step-by-step solution

The terminal potential difference V of a battery is given by the equation: V = E - Ir where E is the electromotive force, I is the current, and r is the internal resistance. Rearranging the formula to solve for r : r = E - V I Substituting the given values E = 6.0 V, V = 5.4 V, and I = 2.0 A: r = 6.0 - 5.4 2.0 r = 0.6 2.0 r = 0.3 Answer: 0.3

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