ExamBro
ExamBro
JEE Mains · Physics · STD 12 - Moving charges and magnetism
  • JEE Mains 2024
  • Hard
  • MCQ

A galvanometer having coil resistance \(10 \ \Omega\) shows a full scale deflection for a current of \(3 \mathrm{~mA}\). For it to measure a current of \(8 \mathrm{~A}\), the value of the shunt should be:

Pick an option to check your answer.
Verified Solution

Answer & Solution

Correct Answer

(C)  \(3.75 \times 10^{-3} \ \Omega\)

Step-by-step Solution

Detailed explanation

Given \(\mathrm{G}=10\  \Omega\)

\( \mathrm{I}_{\mathrm{g}}=3 \mathrm{~mA} \)

\( \mathrm{I}=8 \mathrm{~A}\)

In case of conversion of galvanometer into ammeter.

We have \(\mathrm{I}_{\mathrm{g}} \mathrm{G}=\left(\mathrm{I}-\mathrm{I}_{\mathrm{g}}\right) \mathrm{S}\)

\( S=\frac{I_g G}{I-I_g} \)

\( S=\frac{\left(3 \times 10^{-3}\right) 10}{8-0.003}=3.75 \times 10^{-5} \Omega\)

Same subject
Explore more questions on app