Q. Electric force between two point charges in air or vacuum is F. If we replace air or vacuum by an insulator (dielectric) of relative permitivity Cr the force between the charges will decreaseincreaseremain constantdepends upon composition of dielectric Answer: decrease

Q. An electric field can deflect neutronsraysboth glass rod and silk acquire negative chargenone Answer: none

Q. Capacitance of a capacitor is 100μF and potential difference between plates is 50 volts then charge stored on each plate is 10 mC5 mC4 mC15 mC Answer: 5 mC

Q. In equation Q=CV, C is constant of proportionality called capacitor's powercapacitanceheatelectric intensity Answer: capacitance

Q. If two charges are increased by two times then force Decreases 9 timesIncreases 9 timesIncreases 4 timesDecreases 4 times Answer: Increases 4 times

Q. The force per unit charge is know as electric fluxelectric intensityelectric potentialall of above are same Answer: electric intensity

Q. If the distance between the two point charges become half then force between them becomes doublehalffour timesremains same Answer: four times

Q. Charge on capacitor plates is directly proportional to currentelectric field intensitypotential differenceresistance Answer: electric field intensity

Q. To distinguish between insulators and conductors, we can use electroscopetelescopeendoscopefiberscope Answer: electroscope

Q. The minimum charge on any object cannot be less than 1.6 x 10-19C3.2 x 10-19C9.1 x 109Cno definite value exist Answer: 1.6 x 10-19C

Q. Thunderclouds are charged by friction between clouds and airlayers of cloudswater molecules and airlayers of air Answer: water molecules and air

Q. If mica sheet is placed between the plates of a capacitor the capacity increasesdecreasesincreases then decreasesdecreases then increases Answer: increases