Two-point charges (+Q) and (-2Q) are fixed on the X-axis at positions a and 2a from origin respectively. At what positions on the axis, the resultant electric field is zero

Question:

Options :

a) only x = √2a
b) only x = -√2a
c) Both x = +-√2a
d) only x = (3a/2)

Answer :

b) only x = -√2a

Answer Steps :

Solution :-

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Step2 :-

Step3 :-

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Solution :-

Step1 :-

Step2 :-

Step3 :-

Step4 :-

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