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Most Important Selected Qs for JEE AdvancedPhysicsCurrent Electricity

Paragraph: An ammeter and a voltmeter are connected in series to a battery with an emf of 10 V . When a certain resistance is connected in parallel with the voltmeter, the reading of the voltmeter decreases three times, whereas the reading of the ammeter increases the two times. Question: Find the voltmeter reading after the connection of the resistance.

Options

  1. A1 V
  2. B2 V
  3. C3 V
  4. D4 V

Correct answer

B. 2 V

Step-by-step solution

Initially V ₁+ V ₂=10 ~V Finally V₁ 3 +2 V₂=10 ~V From equation (i) & (ii) We get V₁=6 volt, V₂=4 volt Final reading = V₁ 3 =2 volt

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