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Physics - Practical physics Question with Solution | TestHub

PhysicsPractical physicsMiscellaneousEasy2 minPYQ_2020

PhysicsEasysingle choice

A battery of emf $12 V$ and internal resistance $2 Ω$ is connected in series with a tangent galvanometer of resistance $4 Ω .$ The deflection is $60^{o}$ when the plane of the coil is along the magnetic meridian. To get a deflection of $30^{o},$ the resistance to be connected in series with the tangent galvanometer is

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Answer:

Solution:

$I = k \tan θ, k$ being reduction factor and $I \propto \frac{1}{R}$

$\Rightarrow \frac{R + r}{(R + r) + R^{'}} = \frac{\tan θ^{'}}{\tan θ}$

$\Rightarrow \frac{4 + 2}{6 + R^{'}} = \frac{\tan 30^{o}}{\tan 60^{o}}$

$\Rightarrow R^{'} = 12 Ω$

Stream:NTA_ABHYAS_NEETSubject:PhysicsTopic:Practical physicsSubtopic:Miscellaneous

⏱ 2mℹ️ Source: PYQ_2020

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