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Question

What is the equivalent resistance of a voltmeter with coil resistance Rc=1kΩ and series resistance of 100 kΩ?
  1. 101100kΩ
  2. 99 kΩ
  3. 100101kΩ
  4. 101 kΩ


Solution

The correct option is D 101 kΩ
Series resistor is connected in series with the coil to ensure very small current through the combination.
Req=Rc+RsReq=(100+1)kΩ=101kΩ

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