A voltmeter can read up to V volt. When the series resistance used in the voltmeter is doubled, range of voltmeter is

Question

A voltmeter can read up to V volt. When the series resistance used in the voltmeter is doubled, range of voltmeter is (A) V (B) 2 V  (C) less than 2 V  (D) more than 2 V

Tardigrade Admin · Accepted Answer

Reading of voltmeter V = lg (G + R) ... (i) If resistance R is increased to 2R, the reading of voltmeter, V' = lg(G + 2R) = 2V - Ig G (Using (i))

Q. A voltmeter can read up to $V$ volt. When the series resistance used in the voltmeter is doubled, range of voltmeter is

$V$

$2 V$

less than $2 V$

more than $2 V$

Reading of voltmeter
$V = l_{g} (G + R)$ ... (i)
If resistance $R$ is increased to $2 R$ , the reading of voltmeter,
$V^{'} = l_{g} (G + 2 R) = 2 V - I_{g} G$ (Using (i))

Q. A voltmeter can read up to V volt. When the series resistance used in the voltmeter is doubled, range of voltmeter is

V

2V

less than 2V

more than 2V

Reading of voltmeter V=lg​(G+R) ... (i) If resistance R is increased to 2R, the reading of voltmeter, V′=lg​(G+2R)=2V−Ig​G (Using (i))

Q. A voltmeter can read up to $V$ volt. When the series resistance used in the voltmeter is doubled, range of voltmeter is

$V$

$2 V$

less than $2 V$

more than $2 V$

Reading of voltmeter
$V = l_{g} (G + R)$ ... (i)
If resistance $R$ is increased to $2 R$ , the reading of voltmeter,
$V^{'} = l_{g} (G + 2 R) = 2 V - I_{g} G$ (Using (i))