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  • The deflection of a moving coil galvanometer falls from 60 div to 12 div when a shunt of is connected.The

The deflection of a moving coil galvanometer falls from 60 div to 12 div when a shunt of 12 \Omega is connected.The resistance of the galvanometer is

Option: 1

24\, \Omega


Option: 2

36\, \Omega


Option: 3

48\, \Omega


Option: 4

60\, \Omega


Answers (1)

best_answer


Current in the galvanometer is directly proportional to the angle of deflection \mathrm{i \, \alpha\: \theta}

\mathrm{\Rightarrow \frac{i g}{i}=\frac{12}{60}=\frac{1}{5}\quad -(1)}

when shunt is connected with the galvanometer then

\mathrm{ (i-i_{g}) \cdot S=i_{g}-Q }.
\mathrm{ \Rightarrow Q=\frac{(i-i_{g})}{i_{g}} \cdot S=\left(\frac{i}{i_{g}}-1\right) \cdot S }
\mathrm{Q=(5-1) \times 12 \Omega }
     \mathrm{=48 \, \Omega }.

 

Posted by

Pankaj

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