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If a charge 16Q is at point A and a charge 25Q is at point B, then calculate |E| at origin.

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Important Questions on Electric Charges and Fields

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The charge per unit length of the four quadrants of the ring are, 2λ-2λλ and -λ, respectively. What is the electric field at the centre?

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A charged ball B hangs from a silk thread S, which makes an angle θ with a large charged conducting sheet P, as shown in the figure. The surface charge density σ of the sheet is proportional to,

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Two point charges +8q and -2q are located at x=0 and x=L, respectively. The location of a point w.r.t. +8q charge on the x-axis at which the net electric field due to these two point charges is zero is,
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Two equal negative charges -q are placed at points (0, a) and (0,-a) on y-axis. A positive charge q at rest is left to move from point (2a, 0). This charge will,
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Two charges of equal magnitude q are placed at a distance 2a on the x-axis. Another charge q of mass m is placed mid-way between the two charges. If this charge is displaced from equilibrium state to a distance x(x<<a) along x-axis, then the charge,
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Let ρ(r)=QπR4r be the charge density distribution for a solid sphere of radius R and total charge Q. For a point p inside the sphere at a distance r1 from the centre of the sphere, the magnitude of electric field is,
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A thin semi-circular ring of radius r has a positive charge q distributed uniformly over it. The net field E at the centre O 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,