Question 261: Current Electricity

Question

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?

Accepted Answer

i
g
= 1 mA , R
g
= 100 $$\Omega $$
V = i
g
(R + R
g
)
$$ \Rightarrow $$10 = 1 ÃÂ 10
Ã¢ÂÂ3
(R + 100)
$$ \Rightarrow $$R = 9.9 k$$\Omega $$

Answer

8.9 k$$\Omega $$

Answer

10 k$$\Omega $$

Answer

9.9 k$$\Omega $$

Answer

7.9 k$$\Omega $$

Current Electricity

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?

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