Question

A 100 V voltmeter has full-scale accuracy of 5%. At its reading of 50 V it will give an error of?
(8) A 100 V voltmeter has full-scale accuracy of 5%. At its reading of 50 V it will give an error of
(a) 10% (b) 5%
(c) 2.5% (d) 1.25%

I got two solutions b and c, which one is right ? b ?

Answer 1

Answer is a.

If 100V is %100 then %5 is 5V
Voltmeter can measure
\[100\pm5V\]
if 50V - %100
5V - %x

x=100*5/50=%10

Sorry if answer is wrong. :)

Answer 2

@Nursoltan Thank you for your valuable time !
As per the condition you have given the answer is right, but as per the question,

A 100 V voltmeter has full-scale accuracy of 5%. means For a 100V= 5%
then for 50V= ?
leave it, consider how much u get for 1%=?
I tried and found like...
1%= 100/5=20V (I'm not sure, is this right either)

So, if 1%= 20 then 2%=40, 3%=60, 4%= 80 and 5%= 100
In this case, i get
2.5=50%

Is this acceptable ?

Answer 3

@.Sam. @Preetha Which answer looks correct ?

Answer 4

Thank You in advance !