Class XII

Conservation of charges in tribo electric charging
  1. implies one is positively charged and the other is negatively charged.
  2. implies both are negatively charged
  3. implies both are positively charged
  4. implies half are positively charged and other half are neutral
A cylinder of radius R and length L is placed in an uniform electric field E parallel to the cylinder axis. The total flux for the surface of the cylinder is given by
  1. πR +π 2 L2
  2. πR E
  3. 2πR E
  4. 0
electrostatic force is
  1. force exerted by one charge on another when the two are accelerating in a given frame of reference
  2. force exerted by one charge on another when the two are moving in a given frame of reference
  3. force exerted by an electron on a neutron
  4. force exerted by one charge on another when the two are at rest in a given frame of reference
Charge is quantized means
  1. charge cannot take any arbitrary values, but only values that are integral multiples of the fundamental charge(charge of proton/electron)
  2. charges can take on discrete values that are multiples of charge on neutron
  3. charges can take on any discontinuous value
  4. charges can take on any continuous value
Electric charges are of
  1. 2 types
  2. 5 types
  3. 3 types
  4. 4 types
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