Electrostatics

Question 1

Force on extended bodies

Answer 1

F= KQq ( 1/a - 1/a+L ) / L

Question 2

Force between two rod

Answer 2

F = KQ^2/L^2 [ ln.(a+L)/a - ln.(a+2L)/ (a+L)

Question 3

Force on an charge(q) which is kept on tip of the arc

Answer 3

F= (2kλ/R) .(sin θ /2).q

F = (kQq/ R^2) [ (sin θ/2) / θ/2 ]