Question

Six charges are placed at the corners of a regular hexagon as shown. Then electric field intensity at the centre $O$ will be

• A. Zero
• B. Along $OF$
• C. Along $OE$
• D. Along $OC$

Answer 1

The correct option is A Zero

Consider the charges at opposite sides of $O$. They form a dipole with moment $P=2Qa$

Electrical field due to a dipole on its axis $E=\frac{KP}{x^2}=\sigma$

Since $P=0$

$\because$ $2a=0$