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← JEE Main 2022 · 27 Jun · Shift 2
PhysicsSingle correct+4 / -1Question 42 of 90

JEE Main 2022 · 27 Jun · Shift 2, Physics question 42

Three identical charged balls each of charge 2 C are suspended from a common point P by silk threads of 2 m each (as shown in figure). They form an equilateral triangle of side 1m.

The ratio of net force on a charged ball to the force between any two charged balls will be :

Three balls B1, B2, B3 hanging from point P on 2 m threads, forming a horizontal equilateral triangle of side 1 m.
Choose one option
Answer and worked solution

Official answer: D

Forces from the other two balls have equal size FF and are 60°60° apart: the net is 2Fcos⁡30°=3F2F\cos30°=\sqrt3F.

Ratio 3:1\sqrt3:1.

(D)