JEE MAIN - Physics (2022 - 27th June Evening Shift - No. 12)
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 :
_27th_June_Evening_Shift_en_12_1.png)
1 : 1
1 : 4
$$\sqrt3$$ : 2
$$\sqrt3$$ : 1
Explanation
_27th_June_Evening_Shift_en_12_2.png)
Fnet on charge 3, $${F_1} = {{\sqrt 3 k{q^2}} \over {{1^2}}}$$
Force between any 2 charges
$${F_2} = {{k{q^2}} \over {{1^2}}}$$
So, $${{{F_1}} \over {{F_2}}} = \sqrt 3 $$
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