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JEE Main20231 Feb 2023Evening ShiftPhysicsCurrent ElectricityActual

Given below are two statements : One is labelled as Assertion A and the other is labelled as Reason R. Assertion A : For measuring the potential difference across a resistance of 600 Ω , the voltmeter with resistance 1000 Ω will be preferred over voltmeter with resistance 4000 Ω . Reason R : Voltmeter with higher resistance will draw smaller current than voltmeter with lower resistance. In the light of

Options

  1. AA is not correct but R is correct
  2. BBoth A and R are correct and R is the correct explanation of A
  3. CBoth A and R are correct but R is not the correct explanation of A
  4. DA is correct but R is not correct

Correct answer

A. A is not correct but R is correct

Step-by-step solution

Voltmeter is connected in parallel, so it should have very high resistance as to measure the potential difference, all the current should pass through the resistor and no current should pass through voltmeter for precise readings. The current will divide and travel through the voltmeter if the voltmeter has a low resistance and will then give faulty readings. Thus, A is not correct but R is correct.

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