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Question: Answered & Verified by Expert
A shunt of resistance $1 ~\Omega$ is connected across a galvanometer of $120 ~\Omega$ resistance. A current of $5.5$ ampere gives full scale deflection in the galvanometer. The current that will give full scale deflection in the absence of the shunt is nearly :
PhysicsCurrent ElectricityJEE MainJEE Main 2013 (09 Apr Online)
Options:
  • A
    $5.5$ ampere
  • B
    $0.5$ ampere
  • C
    $0.004$ ampere
  • D
    $0.045$ ampere
Solution:
1936 Upvotes Verified Answer
The correct answer is:
$0.045$ ampere
The current that will given full scale deflection in the absence of the shunt is nearly equal to the current through the galvanometer when shunt is connected i.e. $\mathrm{I}_{\mathrm{g}}$
As $I_g=\frac{I S}{G+S}$
$=\frac{5.5 \times 1}{120+1}=0.045$ ampere

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