Question

The side of an equilateral triangle is 20cm.Two equal point charges (+)3nc are placed at its two corners.what will be the amount of work done in bringing
(+)1nc test charge from infinity to third corner of the triangle.

Answer 1

We know that work done = potential charge

Let be the equilateral triangle

Let charges are placed on corners of and

Let we have to bring charge from infinity to points

to find potential at

potential at potential due to + potential due to


but

and

potential at




Work done=potentialcharge

Work done =