Verified Solution • 2025–26 Session moderate

QJEEM22Ph02bc: JEE Main 2022 Physics - Class 12 JEEM22Ph02bc Solution: A teacher in his physics laboratory allotted an experiment to…

A teacher in his physics laboratory allotted an experiment to determine the resistance (G) of a galvanometer. Students took the observations for 13{1 \over 3} deflection in the galvanometer. Which of the below is true for measuring value of G?

Multiple Choice Options

  • A 13{1 \over 3} deflection method cannot be used for determining the resistance of the galvanometer.
  • B 13{1 \over 3} deflection method can be used and in this case the G equals to twice the value of shunt resistances.
  • C 13{1 \over 3} deflection method can be used and in this case, the G equals to three times the value of shunt resistances.
  • D 13{1 \over 3} deflection method can be used and in this case the G value equals to the shunt resistances.

Step-by-Step Verified Solution

The circuit for the given situation is:

JEE Main 2022 (Online) 25th June Morning Shift Physics - Current Electricity Question 139 English Explanation

Since G and S are in parallel,

⇒\Rightarrow i3{i \over 3} ×\times G = 2i3{2i \over 3} ×\times S

⇒\Rightarrow G = 2S

⇒\Rightarrow G equals twice the value of shunt resistance.

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