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Earn 100

Two points P and Q are maintained at the potentials of 10 V and -4 V, respectively. The work done in moving 100 electrons from P to Q is

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Important Questions on Electrostatics

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A charge Q is placed at each of the opposite corners of a square. A charge q is placed at each of the other two corners. If the net electrical force on Q is zero, then Qqequals:
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Statement 1: For a charged particle moving from point P to point Q, the net work done by an electrostatic field on the particle is independent of the path connecting point P to point Q.

Statement 2: The net work done by a conservative force on an object moving along a closed loop is zero.

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Two identically 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 the density of the material of the sphere is 1.6 g cm-3, the dielectric constant of the liquid is
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The electrostatic potential inside a charged spherical ball is given by ϕ=ar2+b, where r is the distance from the centre, a, b are constants. Then the charge density inside the ball is
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Two identical charged spheres suspended from a common point by two massless strings of length l are initially a distance dd<<l apart because of their mutual repulsion. The charge begins to leak from both the spheres at a constant rate. As a result, the charges approach each other with a velocity v. Then as a function of distance x between them
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Two positive charges of magnitude q are placed at the ends of a side (side 1) of a square of side 2a. Two negative charges of the same magnitude are kept at the other corners. Starting from rest, if a charge Q moves from the middle of side 1 to the centre of square, its kinetic energy at the centre of square is,
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In a uniformly charged sphere of total charge Q and radius R, the electric field E is plotted as a function of distance from the centre. The graph which would correspond to the above will be:
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This questions has Statement 1 and Statement 2. Of the four choices given after the statements, choose the one that best describes the two statements.

An insulating solid sphere of radius R has a uniformly positive charge density ρ. As a result of this uniform charge distribution there is a finite value of the electric potential at the centre of the sphere, at the surface of the sphere and also at a point outside the sphere. The electric potential at infinity is zero.

Statement 1: When a charge is taken from the centre to the surface of the sphere its potential energy changes by qρ3ε0
Statement 2: The electric field at a distance r(r<R) from the centre of the sphere is ρr3ε0