Physics - Electrostatics Question with Solution | TestHub

PhysicsElectrostaticsElectric Field & ForceEasy2 minPYQ_2020

PhysicsEasysingle choice

Point charges $q$ , $- q$ , $2 Q$ and $Q$ are placed in order at the corners $A$ , $B$ , $C$ and $D$ of a square of side $2 b$ . If the field at the midpoint of $CD$ is zero, then $\frac{q}{Q}$ is

Options:

Answer:

Solution:

$E = E_{C} - E_{D} - E_{A} \cos θ - E_{B} \cos θ$
$\frac{k (2 Q)}{b^{2}} - \frac{k Q}{b^{2}} = 2 \times \frac{k q b}{{(b^{2} + 4 b^{2})}^{\frac{3}{2}}}$
$\Rightarrow Q = \frac{2 q}{5 \sqrt{5}}$

Stream:NTA_ABHYAS_NEETSubject:PhysicsTopic:ElectrostaticsSubtopic:Electric Field & Force

⏱ 2mℹ️ Source: PYQ_2020

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