A galvanometer of resistance 20$\ \Omega$ shows a deflection of 10 divisions when a current of 1 mA is passed through it. If a shunt of 4$\ \Omega$is connected and there are 50 divisions on the scale, the range of the galvanometer is

Question

Dr. Abubacker · Accepted Answer

(d) Current for 50 divisions,
$I_{g} = \frac{1 	imes 50}{10} = 2mA$
$	herefore\ \frac{I_{g}}{I} = \frac{S}{S + G\ }$
$\Longrightarrow I = \left( \frac{S + G}{S} ight)I_{g}$
Or
$I = \left( \frac{4 + 20}{4} ight)5mA = 30mA$

Q. A galvanometer of resistance 20$\ \Omega$ shows a deflection of 10 divisions when a current of 1 mA is passed through it. If a shunt of 4$\ \Omega$is connected and there are 50 divisions on the scale, the range of the galvanometer is

Explanation

Reviewed by Dr. Abubacker

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