The electric potential at a point in air due to a charge is 21 V. If the air is replaced by a medium of relative permittivity of 3a then electric potential at that point will be

A. 63 V

B. 21 V

C. 7 V

D. 42 V

Please do not use chat terms. Example: avoid using "grt" instead of "great".

You can do it
  1. An electron- volt (eV) is a unit of
  2. The idea of preventing one component from affecting another through their common electric and magnetic…
  3. Who developed the electromagnetic theory of light in 1862?
  4. Residual magnetism refers to the flux densitya which exists in the iron core when the magnetic field…
  5. If you hold the conductor with right hand so that the stretched thumb points in the direction of the…
  6. Steel is hard to magnetize because of its
  7. The mass of proton is __________ the mass of an electron.
  8. Hysteresis loss can be reduced by one of the following.
  9. What revolves about the positive nucleus in a definite orbit?
  10. Lenz's law is the consequence of the law of conservation of
  11. A germanium atom has an atomic weight of72. How many neutrons are there?
  12. What is the SI unit of reluctance?
  13. Ohm's law cannot be applied to which material?
  14. The emf induced in a coil due to the changing current of another neighboring coil is called
  15. Magnetic fields do not interact with
  16. What bond is formed when electrons in the outermost energy orbits of the atoms are shared between two…
  17. The magnetic energy stored in an inductor is ______ current.
  18. The amount of magnetizing force to counter balance the resid magnetic material is referred to as
  19. The unit of electrical energy is
  20. Which of the following has the highest permeability?
  21. Amorphous solid is also called
  22. Which of the following materials has permeability slightly less than that of free space?
  23. A law stating that the magnetic susceptibilities of most paramagnetic substances are inversely proportional…
  24. When the ferromagnetic substance is inserted in a current- carrying solenoida the magnetic field is
  25. If a 20 V potential is applied across a relay coil with 50 turns having 1 ? of resistancea the total…
  26. When the relative permeability of a material is slightly more than 1a it is called ______ material.
  27. The magnetic flux through a coil changes. This results to the induced emf acting in a direction as to
  28. Who discovered superconductivity in 1911?
  29. A law that states that the current in a thermionic diode varies directly with the three- halves power…
  30. A law establishing the fact that the algebraic su of the rises and drops of the mmf around a closed…