Physics

Physics

Problem

Four point charges

q, -q, 2Q

and

Q

are placed in order at the corners of

A, B, C

and

D

of a square. If the field at the midpoint of

CD

is zero, the value of

\frac{q}{Q}

is (a) 1 (b)

\frac{5}{\sqrt{2}}

(c)

\frac{2\sqrt{2}}{5}

(d)

\frac{5\sqrt{5}}{2}

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