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Physics - Current Electricity Question with Solution | TestHub

PhysicsCurrent ElectricityElectrical instrumentEasy2 minQB

PhysicsEasysingle choice

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

Options:

Answer:

Solution:

If a large resistance $R$ is connected with a battery, then current will be approximately $\frac{ϵ}{R}$ , and $t$ will remain almost constant.

In $1^{s t}$ case, only $(G)$ is connected $\Rightarrow i g = i$

In $2^{n d}$ case,

$i_{g} R_{0} = (I - i_{g}) S \Rightarrow (i_{g})_{2} = (\frac{S}{R _{g} + S}) i$

If $(i_{g})_{2} = \frac{1}{3} (i_{g}), \Rightarrow (\frac{S}{R _{g} + S}) i = \frac{1}{3} i$

$R_{g} = 2 S$

Stream:JEESubject:PhysicsTopic:Current ElectricitySubtopic:Electrical instrument

⏱ 2mℹ️ Source: QB

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