First slide

Moving coil Galvanometer

Question

The resistance of a moving coil galvanometer is 10 $Ω$ and gives a full scale deflection for a current 5 mA The series resistance required to convert it into a voltmeter to read maximum 100 volt is

Easy

A

19,990 $Ω$
B

19980 $Ω$
C

20010 $Ω$
D

20000 $Ω$

Solution

See fig. we know that
$\begin{array}{l} i_{g} = \frac{V}{(R + G)} \\ 5 \times 10^{- 3} = \frac{100}{R + 10} \end{array}$
Solving, we get R = 19990 $Ω$

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