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Class 12 Physics (Part I) Chapter 1 Electric Charges And Fields Quiz 1 (25 MCQs)

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1. An electrostatic force of 2 X 10$^{2}$. newtons is exerted on a charge of 4 coulomb at point P in an electric field. The magnitude of the electric field intensity at P is
2. What is the S. I. unit of electric flux?
3. An electric dipole is placed at an angle of 30$^\circ$ with an electric field intensity 2 x 10$^{5}$ N/C. It experiences a torque equal to 4 N-m. The charge on the dipole, if the dipole length is 2 cm, is .....
4. What would a negative value for F$_{e}$ mean?
5. Two unlike charges of magnitude q are separated by a distance 2d . The potential at a point midway between them is
6. Solid angle is an entity which is:
7. Consider three charged bodies P, Q, R . If P and Q repel each other and P attracts R, what is the nature of the force between Q and R?
8. A pith ball has an electric charge +2q, and it feels a force F when placed a distance d from a second pith ball with an electric charge-q. When the second pith ball is charged to-3q, the force on the pith ball is .....
9. What will be the value of a charge q, such that when it is placed at the centre of two equal and like charges Q, the three charges are in equilibrium.
10. A glass window is placed perpendicular to the direction of sunlight. The amount of light passing through it is:
11. Which of the following describes the electric field around a positive point charge?
12. The number of electrons in one coulomb of charge is .....
13. The property which differentiates two kinds of charges is called .....
14. An electric dipole placed in a non uniform electric field experiences
15. Ms. Josette rubbed two balloons with a piece of wool. What will happen when the balloons are brought near each other?
16. Which of the following describes the direction of electric field lines around a positive charge?
17. An electric dipole is placed at an angle of 30 degree to a non uniform electric field the dipole will experience
18. Three charges +4q, Q and q are placed in a straight line of length l at points distance O, l/2 and l, respectively. What should be Q in order to make the net force on q to be zero?
19. Two pointy charges, one Coulomb each are separated by vacuum and placed 1 meter apart from each other. The force acting between them is .....
20. Electric field lines contracts lengthwise, It shows
21. What is the unit of electric field?
22. When 10$^{19}$ electrons are removed from a neutral metal plate, the electric charge on it is
23. The net force due to different charges around a single charge can be determined using superposition principle. True or False?
24. A charge particle is free to move in an electric field. It will travel
25. A cell whose emf is 2V and internal resistance 0.1ohm is connected with a resistance of 3.9ohm. The voltage across the terminal will be
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