Question 325: Current Electricity

Question

When a current of 5 mA is passed through a galvanometer having a coil of resistance 15$$\Omega $$, it shows full
scale deflection. The value of the resistance to be put in series with the galvanometer to convert it into a
voltmeter of range 0 – 10V is:

Accepted Answer

Given : Current through the galvanometer,
i
g
= 5 ÃÂ 10
Ã¢ÂÂ3
A
Galvanometer resistance, G = 15 $$\Omega $$
Let resistance R to be put in series with the galvanometer to
convert it into a voltmeter.
V = i
g
(R + G)
10 = 5 ÃÂ 10
Ã¢ÂÂ3
(R + 15)
$$ 	herefore $$ R = 2000 Ã¢ÂÂ 15 = 1985
= 1.985 ÃÂ 10
3
$$\Omega $$

Answer

4.005 × 103 $$\Omega $$

Answer

1.985 × 103 $$\Omega $$

Answer

2.535 × 103 $$\Omega $$

Answer

2.045 × 103 $$\Omega $$

Current Electricity

When a current of 5 mA is passed through a galvanometer having a coil of resistance 15$\Omega $, it shows full scale deflection. The value of the resistance to be put in series with the galvanometer to convert it into a voltmeter of range 0 – 10V is:

Choose the correct answer: