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Class 12 Physics (Part I) Chapter 1 Electric Charges And Fields Quiz 6 (25 MCQs)

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1. Two fixed point charges +4q and +q units are separated by a distance a. The point, where the resultant field intensity is zero is:
2. A point charge Q is far from all other charges. At a distance of 2 m from Q, the electric field is 20 N/C. What is the force a charge of 5 Coulombs feels?
3. The magnitude of the electrostatic force between two point charges is F. If the distance between the charges is doubled, the electrostatic force between the charges will become
4. What particle has a negative charge?
5. The electric field lines for a positive charge is always directed away from the charge. True or False?
6. Electric lines of force about negative point charge are
7. Charge Q is kept in a sphere of 5 cm first than it is kept in a cube of side 5 cm. the outgoing flux will be-
8. The distance between two ions of same positive charge is 5 A$^\circ$ and electric force acting on them is 3.7 x 10$^{-9}$ N, then electron loss by each ion is .....
9. The direction of electric field intensity due to a dipole on equatorial point is ..... the direction of dipole moment.
10. Charge q$_{2}$ of mass m revolves around a stationary charge q$_{1}$ in a circular orbit of radius r. The orbital periodic time of q$_{2}$ would be .....
11. The total flux through the faces of the cube with side of length a if a charge q is placed at any one corner of the cube is
12. If an object has a net charge of +2e this means it has
13. If electrons transfer from a wool square to a pvc wand, the wool becomes ..... and the wand becomes .....
14. The area of electric force around an electrically charged particle is called an .....
15. Two similar spheres having +Q and-Q charges are kept at a certain distance. F force acts between the two. If at the middle of two spheres, another similar sphere having +Q charge is kept, then it experiences a force in magnitude and direction as(a) zero having no direction.(b) 8F towards +Q charge.(c) 8F towards-Q charge.(d) 4F towards +Q
16. What do you call the process of charging a conductor by bringing it near another charged object?
17. What is the angle between the axial field and equatorial field of an electric dipole in degrees?
18. A point charge +q is placed at the mid-point of a classroom of size L. The electric flux emerging from the classroom is:
19. You are travelling in a car during a thunderstorm. In order to protect yourself you would prefer to
20. A square sheet of side 'a' is held perpendicular to a uniform magnetic field of strength B. The magnetic flux linked with the surface is:
21. A silk cloth rubbed with a glass rod has a charge $q=-1.6\times10^{-19}C$
22. A charge q is placed at the centre of the line joining the two equal charges Q. The system of three charges will be in equilibrium, if q is equal to
23. A positively charged glass rod is brought near an uncharged pith ball pendulum. What happens to the pith ball?
24. Coulomb's law states that the force between two charged objects will ..... when the magnitude (value) of the object's charge increases.
25. $\phi$ $\frac{q}{\epsilon o}$
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