ELECTROSTATIC

1. Two charges ,each equal to Q are kept at x=-b and x=b on the x -axis. A particle of mass M and change Q is placed at the origin. if charge Q is given a small displacement y( y <<<b) along the y-axis, the net force acting on the particle is proportional to

• y

• -y

• 1/y

• -1/y

The wedge-shaped surface in figure is in a region of uniform electric field E0 along x axis. The net electric flux for the entire closed surface is

• 9Eo

• 12Eo

• 15Eo

• zero

A small ball of mass 2  103 kg having a charge of 1 microC is suspended by a string of length 0.8 m. Another identical ball having the same charge is kept at the point of suspension. Determine the minimum horizontal velocity which should be imparted to the lower ball so that it can make complete revolution in a vertical circle. [Take g = 10 m/s2 .

• 3

• 4

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• 6

Statement -I : Half of the electric field at a point just outside the surface of the charged conductori is due to the charge on the surface in the immediate vicinity of that point

Statement -II: Only the half of the charge resides on the surface of the charged conductor

• Statement I is true ,statement II is true ,statement II is correct explanation for statement I

• Statement I is true ,statement II is true ,statement II is not a correct explanation for statement I

• Statement I is true,Statement II is false

• Statement I is False,Statement II is True

• 1

• 2

• 3

• 4

• 1

• 2

• 3

• 4

• a

• b

• c

• d

• a

• b

• c

• d