Question

The value of series resistance to be used to extend ( 0- 200) V range voltmeter having $2000\Omega /V$ sensitivity to be extended to ( 0-2000) V range.

• A. $3600k\Omega$
• B. $5500k\Omega$
• C. $3400k\Omega$
• D. $4500k\Omega$

Answer 1

The correct option is A $3600k\Omega$

$0-200Vvoltmeterhassensitivity2000\Omega /V$
$So,R_{int}=200\times 2000=400k\Omega$

Now to be extended to 2000V

$So,m=\frac{2000}{20}=10$

$\therefore R_{ext}=R_{int}(m-1)$

$=400k(10-1)=3600k\Omega$