Coulomb’s law quiz

Solve this Coulomb’s Law quiz problems to improve your problem-solving abilities. This quiz consists of 12 multiple choice questions. Here you can find both conceptual and numerical questions in the topic Coulomb’s Law. You can find the solutions of selected questions after you submit the test by clicking “View Results” button at the end of this online quiz.

Coulombs law MCQ online test

1. The electrostatic force between two charges $q_1$ and $q_2$ separated by a distance $r$ is $F$. If the charges are doubled and the separation between them is reduced to half, the electrostatic force will be

$F$

$4F$

$16F$

$64F$

2. Electrostatic force between two charges placed in vacuum is $F$. If the charges are placed at the same separation in a medium of dielectric constant (or relative permittivity) $K$, the force between them will be

$F$

$KF$

$F/K$

$K^2F$

3. Two positive charges $+q$ each are fixed at a certain distance apart. The third equal positive charge $+q$ is placed exactly midway between them. Then the third charge will

move at an angle $45^0$ to the line joining the two charges

move at an angle $90^0$ to the line joining the two charges

move along the line joining the two charges

stay at rest

4. Two charges are placed a certain distance apart in air. When a dielectric sheet is placed between them, the electrostatic force between them will

decrease

increase

remains unchanged

become zero

5. Two small identical spheres having charges +10 µC and –90 µC attract each other with a force of F newton. If they are kept in contact and then separated by the same distance, the new force between them is

F/6

16F

16F/9

9F

6. Identify the wrong statement in the following. Coulomb’s law correctly describes the electric force that

binds the electrons of an atom to its nucleus

binds the protons and neutrons in the nucleus of an atom

binds atoms together to form molecules

binds atoms and molecules to form solids

7. Two equal and opposite charges are placed at a certain distance. The force between them is F. If 25% of one charge is transferred to the other, then the force between them is

F

9F/16

15F/16

4F/5

8. A stationary charge produces

A magnetic field only

An electric field only

Electric field and magnetic field both

None of the above

9. When distance between two charges decreases, electrostatic force between them ____________; this relationship ____________ proportional

Decreases; directly

Decreases; inversely

Increases; inversely

Increases; directly

10. Electric force between two charges a central force.

True

False

11. If $q_1 \cdot q_2 < 0$, then the nature of force between the two charges is repulsive.

True

False

12. Three charges each of + 1μC are placed at the corners of an equilateral triangle. If the force between any two charges be F, the net force on each charge would be

$3F$

$\sqrt 3 F$

$F/3$

$F/\sqrt 3$

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