Charge and Coulomb's law

The law, governing the force between electric charges is known as

• Ampere's law

• Ohm's law

• Coulomb's law

• Faraday's law

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The ratio of the forces between two small spheres with constant charge (a) in air (b) in a medium of dielectric constant K is

• 1 : K

• K : 1

• 1 : K²

• K ²: 1

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A body can be negatively charged by

• Giving excess of electrons to it

• Removing some neutrons from it

• Removing some electrons from it

• Giving some protons to it

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+2C and -6C two charges are repelling each other with a force of 12N . If each charge is given -2C of charge, then the value of the force will be

• 4 N (Attractive)

• 4 N (Repulsive)

• 8 N (Repulsive)

• zero

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When  $10^{14}$   electrons are removed from a neutral metal sphere, the charge on the sphere becomes

• 16  $\mu$  C

• - 16  $\mu$  C

• 32  $\mu$  C

• - 32  $\mu$  C

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Two point charges placed at a certain distance r in air exert a force F on each other. Then the distance r' at which these charges will exert the same force in a medium of dielectric constant k is given by

• r

• r/K

• $\frac{r}{\sqrt{k}}$

• $r\sqrt{k}$

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Two charges of equal magnitudes and at a distance r exert a force F on each other. If the charges are halved and distance between them is doubled, then the new force acting on each charge is

• F / 8

• F / 4

• 4F

• F/16

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Six charges, three positive and three negative of equal magnitude are to be placed at the vertices of a regular hexagon such that the electric force on a test charge at O is double the electric force when only one positive charge of same magnitude is placed at R. Which of the following arrangements of charges is possible for P, Q, R, S, T and U respectively

• + , - , +, - , - , +

• + , - , + , - , + , -

• + , + , - , + , - , -

• -, + , + , - , + , -

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The charge q is projected into a uniform electric field E, work done when it moves a distance Y is

• qEy

• qY/E

• qE/Y

• Y/qE

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Tick the correct option.

• Electrostatic force is a conservative in nature.

• Two identical metallic spheres of exactly equal masses are taken. One is given a positive charge Q Coulombs and the other an equal negative charge. Their masses after charging are different.

• The electric force between two charges changes, if we bring a third charge closer to them.

• Electrostatic force is both attractive and repulsive.

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