\(25\,\Omega \) અવરોધ ધરાવતા ગેલ્વેનોમીટરના પૂર્ણ આવર્તન માટે \(1\,mA\) પ્રવાહની જરૂર પડે છે. \(2\,A\) પ્રવાહનું આવર્તન દર્શાવે તેવો એમીટર બનાવવા માટે તેની સાથે કેટલા મૂલ્યનો શંટ અવરોધ જોડાવો પડે?

A \(2.5 \times {10^{ - 2}}\,\Omega \)
B \(1.25 \times {10^{ - 3}}\,\Omega \)
C \(2.5 \times {10^{ - 3}}\,\Omega \)
D \(1.25 \times {10^{ - 2}}\,\Omega \)

Verified Solution

Answer & Solution

Correct Answer

(D) \(1.25 \times {10^{ - 2}}\,\Omega \)

Step-by-step Solution

Detailed explanation

A ccording to question, current through galvanometer, \(\mathrm{I}_{\mathrm{g}}=1\, \mathrm{mA}\) Current through shunt \(\left(I-I_{g}\right)=2 \,A\) Galvanometer resistance \(\mathrm{R}_{\mathrm{g}}=25 \,\Omega\) Resistance of shunt, \(\mathrm{S}=?\)…

Apply the relevant identity from the chapter and substitute the values established in the previous step, keeping the original constraint in view.

Use the simplified expression to isolate the unknown, then plug the result back into the question setup to confirm the working is internally consistent.

Cross-check against a boundary or limiting case. Both the dimensional balance and the qualitative behaviour at the extreme should agree with the candidate answer.

Combine the steps above to identify the correct option. The remaining choices each fail at least one of the consistency, dimensional, or boundary checks.

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