Current Electricity Charging Discharging Of Capacitors Question 149
Question: A microammeter has a resistance of $ 100,\Omega $ and full scale range of $ 50,\mu A $ . It can be used as a voltmeter or as a higher range ammeter provided a resistance is added to it. Pick the correct range and resistance combination
[SCRA 1996; AMU (Med.) 2001; Roorkee 2000]
Options:
A) 50 V range with $ 10,k\Omega $ resistance in series
B) 10 V range with $ 200,k\Omega $ resistance in series
C) 10 mA range with $ 1,\Omega $ resistance in parallel
D) 10 mA range with $ 0.1,\Omega $ resistance in parallel
Show Answer
Answer:
Correct Answer: B
Solution:
To convert a galvanometer into an ammeter, a shunt $ S=\frac{I _{g}}{I-I _{g}}G $ is connected in parallel with it. To convert a galvanometer into a voltmeter, a resistance $ R=\frac{V}{I _{g}}-G $ is connected in series with it.
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