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Question

# Two point charge Q and −3Q are placed at some distance apart. If the electric field at the location of Q is →E, the field at the location of −3Q is:

A
E
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B
E
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C
+E3
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D
E3
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Solution

## The correct option is C +→E3Given Electric field at A=→E→E : Magnitude & direction Magnitude : E direction : (x−axis)Now, E=K(3Q)r2 {Electric field due to charge at B} or KQr2=E1 {E1: Electric field magnitude at B due to A}∴E1=E3for direction at E1, ∴ Q is a +ve charge particle & electric field will be along +x−axis,∴→E=+→E3 {or in direction of →E itself}∴ Option (C) is the correct answer.

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