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In the experiment of calibration of voltmeter, a standard cell of e.m.f. 1.1 volt is balanced against 440 ~cm of potential wire. The potential difference across the ends of resistance is found to balance against 220 ~cm of the wire. The corresponding reading of voltmeter is 0.5 volt. The error in the reading of volmeter will be:

Options

  1. A-0.15 volt
  2. B0.15 volt
  3. C0.5 volt
  4. D-0.05 volt

Correct answer

D. -0.05 volt

Step-by-step solution

In a voltmeter gathered V l ~V = k l gathered Now, it is given E =1.1 volt for l₁=440 ~cm and V =0.5 volt for l₂=220 ~cm Let the error in reading of voltmeter be V then, aligned &1.1=400 ~K and (0.5- V )=220 ~K . & 1.1 440 = 0.5- V 220 & V =-0.05 volt aligned

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