Physics - Current Electricity Question with Solution | TestHub

PhysicsCurrent ElectricityElectrical instrumentMedium2 minPYQ_2018

PhysicsMediumsingle choice

The deflection in galvanometer falls to ${(\frac{1}{4})}^{t h}$ when it is shunted by $3 Ω$ . If additional shunt of $2 Ω$ is connected in parallel to earlier shunt, the deflection in galvanometer falls to

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Answer:

Solution:

$I - \frac{I}{4} = \frac{3 I}{4}$
$\frac{R I}{4} = \frac{3 I}{4} \times 3$
$R = 9 Ω$

$I = I_{1} + I_{2}$ ...(1)
$9 I_{1} = \frac{6}{5} I_{2}$ ...(2)
$\Rightarrow$ $\frac{15}{2} I_{1} = I_{2}$
Using equation (1)
$I = I_{1} + \frac{15}{2} I_{1} = \frac{17}{2} I_{1}$
$I_{1} = \frac{2 I}{17}$
$I_{1} =$ $\frac{I}{17 / 2} = \frac{I}{8.5}$

Stream:MHT_CETSubject:PhysicsTopic:Current ElectricitySubtopic:Electrical instrument

⏱ 2mℹ️ Source: PYQ_2018

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