KCET · Physics · Magnetic Effects of Current
The deflection in a moving coil galvanometer is reduced to half when it is shunted with a \(40 \Omega\) coil. The resistance of the galvanometer is
- A \(80 \Omega\)
- B \(40 \Omega\)
- C \(20 \Omega\)
- D \(15 \Omega\)
Answer & Solution
Correct Answer
(B) \(40 \Omega\)
Step-by-step Solution
Detailed explanation
We know,
\(\frac{I_{G}}{I}=\frac{1}{2}\)
\(\frac{S}{G+S}=\frac{1}{2}\)
\(\frac{I_{G}}{I}=\frac{40}{G+40}=\frac{1}{2}\)
\(G=40 \Omega\)
\(\frac{I_{G}}{I}=\frac{1}{2}\)
\(\frac{S}{G+S}=\frac{1}{2}\)
\(\frac{I_{G}}{I}=\frac{40}{G+40}=\frac{1}{2}\)
\(G=40 \Omega\)
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