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NEETPhysicsCurrent Electricity

A storage battery of emf 8 V and internal resistance 0.5 is being charged by a 12 V DC supply using a series resistor of 3.5 . What is the terminal voltage of the battery during the charging process?

Options

  1. A8.5 V
  2. B7.5 V
  3. C10.5 V
  4. D8.0 V

Correct answer

A. 8.5 V

Step-by-step solution

During the charging of a battery, the positive terminal of the DC supply is connected to the positive terminal of the battery. The net emf in the circuit is the difference between the supply voltage and the battery emf. Net emf = 12 V - 8 V = 4 V Total resistance in the circuit = R + r = 3.5 + 0.5 = 4 Charging current I = Net emf Total resistance = 4 4 = 1 A During charging, the current enters the positive terminal of the battery. Therefore, the terminal voltage ( V ) is greater than its emf ( E ). V = E + Ir = 8 +

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