The range of voltmeter is 10 V and its internal resistance is 
. To convert it to a voltmeter of range 15 V , how much resistance is to be added?
A
Add 
resistor in parallel
resistor in parallel B
Add 
resistor in series
resistor in series C
Add 
resistor in parallel
resistor in parallel D
Add 
resistor in series
resistor in series
Text Solution
Verified by ExpertsThe correct answer is:
B
The current in case of voltmeter of range 10 V and resistance 
is
… (i)
Let X be the resistance connected in order to make a voltmeter with range 15 V having current,
… (ii)
Equating Eqs. (i) and (ii), we get
Then, 
must be connected in series, because 
when current is constant.
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