Question

Two identical pendulums, A and B, are
suspended from the same point. The bobs
are given positive charges, with A having
more charge than B. They diverge and
reach equilibrium, with A and B making
angles 0 and 02 with the vertical
respectively.
(A) 0. > 02
(B) 0, < 02
(C) 01 = 02
(D) The tension in A >B

Answer 1

Answer:

Coulomb's electrostatic force acting on 2 charged particles is equal if they are kept isolated.

i.e it doesn't matter which bob has more charge, the force acting between them will still be the same and thus they will make the same angle from the vertical.

From Coulomb's law, the force acting on both the particles will be

F =

r

2

kQq

Hence , T

1

=T

2

, which implies θ

1

=θ

2

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