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Who demonstrated the theory of electromagnetic induction in 1831?

A. Michael Faraday

B. Andre Ampere

C. James Clerk Maxwell

D. Charles Coulomb

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  1. The electric potential at a point in air due to a charge is 21 V. If the air is replaced by a medium…
  2. Which of the following is a paramagnetic material?
  3. What bond is formed when electrons in the outermost energy orbits of the atoms are shared between two…
  4. The relation between absolute permittivity of air ( 0)a absolute p and velocity of light (c) is given…
  5. The current of electric circuit is analogous to which quantity of a m
  6. One coulomb of charge consists of ________ electrons.
  7. How much is the flux in Weber in the above problem?
  8. The ratio of the permeability of material to the permiabiity of air or vacuum.
  9. Calculate the flux density that will be produced by the field intensity of 2000 a. t/m for a permeability…
  10. The temperature coefficient of resistance of a conductor ______ with an increase in temperature.
  11. The force acting on a unit n- pole placed at that point is called
  12. The force between two magnetic poles is _____ their poles strength.
  13. Electron is a Greek word for
  14. The ability of a material to conduct magnetic flux through it.
  15. States that the ratio of the thermal conductivity is proportional to the absolute temperature for all…
  16. What principle states that each electron in an atom must have a different set of quantum numbers?
  17. What is the main advantage of temporary magnets?
  18. Permanent magnets can be found in
  19. What is the maximum number of electrons that can be accommodated in the last orbit of an atom?
  20. A magnetic circuit carries a flux iin the iron part and a fluxgin the air gap. What is the leakage coefficient?
  21. An electron- volt (eV) is a unit of
  22. Which of the following is a paramagnetic material?
  23. The conduction of electricity across the surface of a dielectric is called
  24. How many turns are needed to produce a magnetomotive force of 1000 A.t for a coil with 6 amperes?
  25. The permittivity of a material is given by one of the following formulas.
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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
  27. The emf induced in a coil due to the changing current of another neighboring coil is called
  28. All matters (gasa liquid and solid) are composed of
  29. The simplest type of atom to exist is the ______ atom.
  30. What is the SI unit of conductivity?