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If two similar charges 1 coulomb each are placed 1 m apart in aira then the force of repulsion is

A. 8 10^6 N

B. 9 10 ^9 N

C. 10^6 N

D. 5 10^6 N

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  1. Ohm's law cannot be applied to which material?
  2. Which of the following materials has the least hysteresis loop area?
  3. Who discovered superconductivity in 1911?
  4. The resistivity of a conductor ___________ with an increase in temperature.
  5. __________ is a substance of whose molecules consist of the same kind of atom.
  6. Whenever a conductor cuts magnetic fluxa an emf is induced in it. This is known as
  7. The uncharged particles which have no effect on its atomic charge.
  8. How many neutrons does a copper atom have?
  9. The lagging effect between flux density of the material and the magne
  10. The temperature coefficient of resistance of insulators is
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    If the resistance of a material 2 m long and 2 m^2 in area of cross-section is 1.6 10^-8 ?a then its resistivity is
  12. One that has magnetic poles produced by internal atomic structure with no external current necessary
  13. What is the maximum number of electrons that can be accommodated in the last orbit of an atom?
  14. A negative ion results when an atom gains an additional
  15. A theorem which states that an electric current flowing in a circuit produces a magnetic field at external…
  16. What is the main advantage of temporary magnets?
  17. Why is it that the magnitude of magnetomotive force required for air gap is much greater than that required…
  18. Magnetic effects of the earth as a huge magnet with north and south poles.
  19. The relative permeability of a magnetic material is 10^5. What is its permeability?
  20. If a 20 V potential is applied across a relay coil with 50 turns having 1 ? of resistancea the total…
  21. Which of the following materials has the highest dielectric strength?
  22. The simplest type of atom to exist is the ______ atom.
  23. If the distance between two magnetic poles decreases by 2 timesa the force between them
  24. An atom or a group of atoms that carries a net electric charge.
  25. What is the value of the absolute permittivity of air?
  26. What is the SI unit of specific resistance or resistivity?
  27. What is the practical unit of electrical energy?
  28. The magnitude of the induced emf in a coil is directly proportional to the rate of change of flux linkages.…
  29. Who discovered the most important electrical effects which is the magnetic effect?
  30. ______ is an electromagnet with its core in the form of a close magnetic ring.