A galvanometer having a coil resistance 100 Ω gives a full scale deflection when a current of 1 m A is passed through it. What is the value of the resistance which can convert this galvanometer into a

Question

A galvanometer having a coil resistance $100 Ω$ gives a full scale deflection when a current of $1 m A$ is passed through it. What is the value of the resistance which can convert this galvanometer into a voltmeter given full scale deflection for a potential difference of $10 V ?$

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Answer:

D

Solution:

$V_{g} = i_{g} R_{g} = 0.1 V$
$V = 10 V$
$R = R_{g} (\frac{V}{V_{g}} - 1)$
$= 100 \times 99 = 9.9 K Ω$

TestHub · Accepted Answer

V g = i g R g = 0.1 V V = 10 V R = R g V V g - 1 = 100 × 99 = 9.9 K Ω

Physics - Current Electricity Question with Solution | TestHub

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