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Q.

An ammeter has a resistance of 50 Ω and a full scale deflection current of 50 μA. It can be used as a voltmeter or as a higher range ammeter provided that a resistance isadded to it. Choose the correct range and resistance combination from the following

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a

20 V range with approximately 400 kΩ resistance in series

b

100 V range with approximately 2 × 106Ω resistance in series

c

1 mA range with 50Ω resistance in parallel

d

0.1 mA range with 50Ω resistance in parallel

answer is A.

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Detailed Solution

For ammeter,i=imaxRs+RARs⇒i=0.1mA for Rs=50Ω  [as RA=50Ω and imax=50μA ] For voltmeter,V=imaxRA+RV⇒ V≈10V for Rv=200kΩ
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