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Physics - Electrostatics Question with Solution | TestHub

PhysicsElectrostaticsPotential & potential energyMedium2 minPYQ_2018

PhysicsMediumsingle choice

Four point charges $- Q, - q, 2 q$ and $2 Q$ are placed, one at each corner of the square. The relation between $Q$ and $q$ for which the potential at the centre of the square is zero is

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Answer:

Solution:

Let the side length of square be ' $a$ ' then potential at centre $O$ is $V = \frac{k ( - Q )}{( \frac{a}{2} )} + \frac{k ( - q )}{\frac{a}{2}} + \frac{k ( 2 q )}{\frac{a}{2}} + \frac{k ( 2 Q )}{\frac{a}{2}} = 0$
$= - Q - q + 2 q + 2 Q = 0 \Rightarrow Q + q = 0$ $\Rightarrow Q = - q$

Stream:VITEEESubject:PhysicsTopic:ElectrostaticsSubtopic:Potential & potential energy

⏱ 2mℹ️ Source: PYQ_2018

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