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NEETPhysics-Electrostatics

NEET Physics Electric Field MCQ Question

Type: MCQ-numerical-Hard-Class 12

Five charges q each are placed at the corners of a regular pentagon of side a. What will be the electric field at O if the charge at A is replaced by –q?

Question diagram
A

14πε02qa2\frac{1}{4\pi\varepsilon_0} \frac{2q}{a^2} along OA→\overrightarrow{OA}

B

14πε02qa2\frac{1}{4\pi\varepsilon_0} \frac{2q}{a^2} along AO→\overrightarrow{AO}

C

14πε0qa2\frac{1}{4\pi\varepsilon_0} \frac{q}{a^2} along OA→\overrightarrow{OA}

D

14πε0qa2\frac{1}{4\pi\varepsilon_0} \frac{q}{a^2} along AO→\overrightarrow{AO}

Correct Answer

Option 2

Detailed Explanation

Replacing one charge with -q creates a net electric field directed along AO→\overrightarrow{AO} due to symmetry and vector addition.

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