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Physics - Current Electricity Question with Solution | TestHub

PhysicsCurrent ElectricityElectrical instrumentEasy2 minQB

PhysicsEasysingle choice

A galvanometer having coil resistance $10Ω$ shows a full scale deflection for a current of $3 mA$ . For it to measure a current of $8 A$ , the value of the shunt should be:

Options:

Answer:

Solution:

Given $G = 10Ω$ , $I_{g} = 3 mA$ and $I = 8 A$ . Let's consider the following figure:

From the figure, we have

$I_{g} G = (I - I_{g}) S \Rightarrow S = \frac{I _{g} G}{I - I _{g}} \Rightarrow S = \frac{( 3 \times 1 0 ^{- 3} ) 10}{8 - 0.003} = 3.75 \times 1 0^{- 3} Ω$

Stream:JEESubject:PhysicsTopic:Current ElectricitySubtopic:Electrical instrument

⏱ 2mℹ️ Source: QB

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