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Question 1 of 21
1. Question
Due to motion of charge , its magnitude
- Does not change
- Changes
- Increases or decreases depends on its speed
- Cannot be predicted
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Question 2 of 21
2. Question
Induction precedes attraction because
- A charged body can attract an uncharged body due to induction of opposite charge on it.
- An uncharged body can attract an uncharged body due to induction of opposite charge on it.
- A charged body can attract an uncharged body due to induction of same charge on it.
- A charged body can attract another charged body due to induction of same charge on it.
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Question 3 of 21
3. Question
A soap bubble is given a negative charge , then its radius
- Increases
- Decreases
- Remains unchanged
- Nothing can be predicted.
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Question 4 of 21
4. Question
The coulomb electrostatic force is defined for
- Two point charges at rest
- Two spherical charges at rest
- Two spherical charges in motion
- Two point charges in motion
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Question 5 of 21
5. Question
The law, governing the force between electric charges is known as
- Coulomb’s law
- Ampere’s law
- Ohm’s law
- Faraday’s law
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Question 6 of 21
6. Question
Two identical metallic spheres A and B of exactly equal masses are given equal positive and negative charges respectively.
- Mass of A < mass of B
- Mass of A >= Mass of B
- Mass of A = mass of B
- Mass of A > mass of B
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Question 7 of 21
7. Question
A body can be negatively charged by
- giving excess of electrons to it
- giving some protons to it
- removing some electrons to it
- removing some neutrons from it
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Question 8 of 21
8. Question
The electric field at a point on equatorial line of a dipole and direction of the dipole moment
- will be in opposite direction
- will be parallel
- will be perpendicular
- are not related
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Question 9 of 21
9. Question
The pair of particles which have same acceleration in a uniform electric field is
- deuteron and alpha particle
- proton and deuteron
- proton and alpha particle
- electron and positron
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Question 10 of 21
10. Question
An electron enters an electric field with its velocity in the direction of the electric lines of force.Then
- The velocity of the electron will decrease
- The velocity of the electron will increase
- The path of the electron will be a parabola
- The path of the electron will be a circle
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Question 11 of 21
11. Question
Identify incorrect for electric charge q
- Non-transferable
- Quantized
- Conserved
- Additive
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Question 12 of 21
12. Question
The wrong statement about electric lines of force is
- They have physical existence
- They have the same form for a point charge and a sphere
- They do not intersect each other at a point
- They originate from the positive charge and end end on negative charge
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Question 13 of 21
13. Question
Electric lines of force always leave an equipotential surface
- Perpendicular to the surface
- at an angle to the surface
- parallel to the surface
- parallel or perpendicular to the surface
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Question 14 of 21
14. Question
An electric dipole kept in uniform electric field experiences
- a torque but not a force
- a force and a torque
- a force but not a torque
- neither a force nor a torque
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Question 15 of 21
15. Question
Two electrons separated by distance ‘ r ‘ experience a force F between them. The force between a proton and singly ionized helium atom separated by distance 2r is
- F / 4
- F/2
- 2F
- 4F
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Question 16 of 21
16. Question
Two charges of equal magnitude 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/16
- 4F
- F/4
- F/8
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Question 17 of 21
17. Question
Two positive charges separated by a distance of 2 m exert a force of 0.36 N. If the combined charge is 26 micro coulombs the charges are ( in micro coulombs )
- 16 , 10
- 20 , 6
- 18 , 8
- 13 , 13
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Question 18 of 21
18. Question
The force between two similar charges of magnitude 2 C each separated by a distance 2 Km
- 9 X 10^3 N
- 9 N
- 300 N
- 50 N
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Question 19 of 21
19. Question
The electric charge of 1 micro coulomb , -1 micro coulomb and 2 micro coulomb are placed in air at the corners A,B and C respectively of an equilateral triangle ABC having length of each side 10 cm. The resultant force on the charge at C is
- 1.8 N
- 0.9 N
- 2.7 N
- 3.6 N
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Question 20 of 21
20. Question
The Two charges (+2 coulomb, –2 coulomb) are placed at a distance 0.5 m. Their dipole moment will be
- 1 C-m
- 2 C-m
- 3 C-m
- 4 C-m
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Question 21 of 21
21. Question
Four different shaped metallic conductors are charged and mounted on insulating stands. Which of the following is the best suited shape to retain the charges for a longer time?
- Sphere
- Cube
- Cylinder
- Cone
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