Question

Please answer this question​

Answer 1

Answer:

if r is the distance between Q and -2Q,

electric field due to -2Q at the location of Q.

i.e. E = ke -(2Q)/r² = -2ke Q/r² ← (eqⁿ 1)

electric field due to Q at the location of -2Q.

i.e, E = ke Q/r² ← ( eqⁿ 2)

Thus from (eqⁿ 1 ) and (eqⁿ 2), E` = -E/2

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option A is correct