Question

Three charges + 20 esu, -25 esu and +50 esu are placed at the
points A, B and C respectively on a straight line. What force will
act on the charge placed at B ? Given AB = 10 cm; BC = 15 cm.
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Answer 1

Answer:

i solved it (easy one) here are the snaps ...

i numbered corners as 1,2,3 & 4

i calculate force on 2 due to 1,3 & 4

F21 = force on 2 due to 1

F23 = force on 2 due to 3

F is resultant of F21 & F23 directed towards diagonal

add them by vector resultant

F24 is also in the same direction along diagonal

so net force

Fnet = F24 + F