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13.10. Two capacitors of capacitances 6 \mu \mathrm{F} and 12 \mu \mathrm{F} are connected in parallel with a 12 \mathrm{~V} battery. Find the equivalent capacitance of the combination. Find the charge and the potential difference across each capacitor.Ans. (18 \mu \mathrm{F} 72 \mu \mathrm{C} 144

13.19. What are hazards of staticelectricity?

The electric flux through the surface of a sphere having a point charge at its centre depends upon:A) Surface area of sphereB) Radius of sphereC) Quantity of charge inside the sphereD) None of these

An electric field is most directly related to:A) The momentum of a test chargeB) The kinetic energy of a test chargeC) The potential energy of a test chargeD) The force acting on a test charge

13.4. What is gold leaf electroscope? Discuss its working principle with a labelled diagram.

Three capacitors of capacitance 2 \mu \mathrm{F} each are connected in parallel. Their equivalent capacitance will be:A) 0.66 \mu \mathrm{F} B) 4 \mu \mathrm{F} C) 6 \mu \mathrm{F} D) 1.5 \mu \mathrm{F}

The force experience by a charge 10 \mu \mathrm{C} when placed at a point is 10^{-5} \mathrm{~N} . the electric field intensity at the point is:A) 0.1 \mathrm{NC}^{-1} B) 1 \mathrm{NC} C) 10 \mathrm{NC}^{-1} D) 1 \mathrm{NC}^{-1}