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(a) What is least count of voltmeter ? ...

(a) What is least count of voltmeter ?
(b) In a voltmeter there are 20 divisions between the '0' mark and 0.5 V mark. Calculate its least count.

Text Solution

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(a) The minimum potential difference measured by a voltmeter between the two given terminals is called the least count of that voltmeter.
(b) Two given marks of the voltmeters= 0 and 0.5 V
Potential difference = 0.5 - 0 = 0.5 V
No. of divisions between these two marks = 20
Least count `= (0.5)/(20) = (5)/(20xx10)=(1)/(40)=0.025` volts
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