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NTA Abhyas JEE Main2020PhysicsCurrent ElectricityPractice

An ammeter, voltmeter and a resistor are connected in series to a cell and the readings are noted as I and V . If another resistor R is connected in parallel with a voltmeter, then

Options

  1. AI and V increase
  2. BI increases
  3. CI and V will remain same
  4. DI decreases

Correct answer

B. I increases

Step-by-step solution

When the resistor R is connected in parallel with voltmeter, the effective resistance in the circuit decreases because 1 R = 1 R 1 + 1 R 2 Therefore current, I = V R increases. As I increases, potential across R increases and hence potential across voltmeter decreases. Hence reading of voltmeter decreases.

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