Question

Plz solve this question example 1.7 class 12 physics... Ques is below

Answer 1

force at c

As components are making an angle 60

So force = √f^2 + f^2 + 2f^2 cos60

= √2f^2 + f^2

= √3f^2 = f√3

Force at A and B

as components making an angle

( 180 - 60 ) = 120

So force = √f^2 + f^2 + 2f^2 cos120

= √2f^2 + 2f^2 cos( 180-60)

= √2f^2 -2f^2 cos60

=√2f^2 - f^2

= √f^2

= f

where f = kq^2/l^2