Electric Charges And Fields

Physics
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A few electric field lines for a system of two charges and fixed at two different points on the -axis are shown in the figure. These lines suggest that

A
B
C
at a finite distance to the left of the electric field is zero
D
at a finite distance to the right of the electric field is zero
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A positive point charge is fixed in space. A negative point charge of mass revolves around the fixed charge in an elliptical orbit. The fixed charge is at one focus of the ellipse. The only force acting on the negative charge is the electrostatic force due to the positive charge. Then which of the following statements is true?

A
Linear momentum of negative point charge is conserved.
B
Angular momentum of negative point charge about the fixed positive charge is not conserved.
C
Angular momentum of negative point charge about the fixed positive charge is conserved.
D
Angular velocity of the charge is conserved about charge.
Hard
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A point charge is revolving in a circle of radius around a fixed infinite line charge with positive charge per unit length. Now the point charge is shifted and it revolves in a circle of radius . Then :

A
speed of the point charge remain constant
B
speed of the point charge will be change
C
angular velocity of the point charge about line charge does not change
D
work done by all forces is non-zero
Hard
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