Question

Calculate the magnitude direction of force on a unit positive charges at the centre of a square of each side 2m when three charges of +8 each are placed at the three corners of the square

Answer 1

Let the side of a square be a, where q1=q2=q3=q4

We know that F=keq1q2r2 and since q1=q2=q3=q4, F3=keqq(a2–√)2=keq22a2

Similarly, F2=keqqa2=keq2a2

Therefore F3F2=keq22a2keq2a2

⇒F3F2=12