Two identical non-conducting solid spheres of same mass and charge are suspended in air from a common point by two non-conducting, massless strings of same length. At equilibrium, the angle between the strings is α .

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Correct answer: A. electric force between the spheres remains unchanged

Tsinθ = F; Tcosθ = mg Divide, tanθ = (F)/(mg) . . . (1) As force between two charged bodies doesn't depend upon medium. Hence, the force between them remains same because the distance spheres is same. When it is submerged in liquid then T ^ ' sinθ = F ε _ r T ^ ' cosθ = mg(1 - ρ _ ℓ ρ _ s ) Divide, tanθ = F mg (1 - ρ _ l ρ _ S ) ε _ r . . . (2) Equating (1) & (2) 1 - ρ _ ℓ ρ _ s = 1 ε _ r ; 1 - 800 ρ _ s = (1)/(21) ρ _ s = 840kg m ^ - 3 T ^ ' = T ε _ r = (T)/(21)

Two identical non-conducting solid spheres of same mass and charge...

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