A galvanometer having a coil resistance $100 \Omega$ gives a full scale deflection when a current of 1 mA is passed through it. What is the value of the resistance which can convert this galvanometer into a voltmeter giving full scale deflection for a potential difference of 10 V ?
Select the correct option:
A
$10 \mathrm{k} \Omega$
B
$9.9\mathrm{k} \Omega$
C
$8.9 \mathrm{k} \Omega$
D
$7.9 \mathrm{k} \Omega$
✓ Correct! Well done.
✗ Incorrect. Try again or view the solution.
Solution
V = 10 volt
When 1 mA current will be flowing
∴ 10 = 1 × 10⁻³ (100 + R₀)
⇒ 10000 − 100 = 9900 Ω = R₀
⇒ R₀ = 9.9 kΩ
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