Two identical charged spheres are suspended by strings of equal lengths. The strings make an angle of 30° with each other. When suspended in a liquid of density 0.8 g cm–3, the angle remains the same. If density of the material of the sphere is 1.6 g cm–3, the dielectric constant of the liquid is

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Two identical charged spheres are suspended by strings of equal lengths. The strings make an angle of 30° with each other. When suspended in a liquid of density 0.8 g cm^–3, the angle remains the same. If density of the material of the sphere is 1.6 g cm^–3, the dielectric constant of the liquid is

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Two charges, each equal to q, are kept at x = – a and x = a on the x–axis. A particle of mass m and charge q₀ = q/2 is placed at the origin. If charge q₀ is given a small displacement (y << a) along the y–axis, the net force acting on the particle is proportional to

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