Electrostatics MCQs

Q. The direction of electric field due +0 positive charge is . away from the charge towards the charge both A. and B. none of the above Answer: away from the charge

Q. If three 15 uF capacitors are connected in series, the net capacitance is 5 uF 30 uF 45 uF 50 uF Answer: 5 uF

Q. For making a capacitor, it is better to select a dielectric having low permittivity high permittivity permittivity same as that of air permittivity slightly more than that of air Answer: high permittivity

Q. A capacitor stores 0.24 coulombs at 10 volts. Its capacitance is 0.024 F 0.12 F 0.6 F 0.8 F Answer: 0.024 F

Q. If the sheet of a bakelite is inserted between the plates of an air capacitor, the capacitance will decrease increase remains unchanged become zero Answer: increase

Q. The ability of charged bodies to exert force on 6ne another is attributed to the existence of electrons protons neutrons electric field Answer: electric field

Q. An electrolytic capacitor can be used for D.C. only AC. only both D.C. as well as A.C. Answer: D.C. only

Q. In electrostatic air cleaner, air mixed with dust and pollen enters device across positively charged mesh negatively charged mesh neutral mesh dual charged mesh Answer: positively charged mesh

Q. If a charged rod is brought closer to a gas filled balloon then Radius decreases Balloon bursts Radius increase Balloon squeezes Answer: Radius increase

Q. Coulomb’s force between 2 point charges 10µC and 5µC placed at a distance of 150cm is 0.2 N 0.5 N 2 N 10 N Answer: 0.2 N