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Which of the following is a natural magnet?

A. Steel

B. Magnesia

C. Lodestone

D. S oft iron

You can do it
  1. The conduction of electricity across the surface of a dielectric is called
  2. When the relative permeability of a material is slightly less than 1a it is called _____ material.
  3. The induced emf in a wire loop that is moved parallel to a uniform magnetic field is
  4. The potential at a point due to a charge is 15 V. If the distance is times, the potential at the point…
  5. The permeability of permalloy is
  6. An effect which is generally used in the gausameter to measure flux density.
  7. Who discovered superconductivity in 1911?
  8. The permittivity of a material is given by one of the following formulas.
  9. The electric potential at a point in air due to a charge is 21 V. If the air is replaced by a medium…
  10. If the length and area of cross-section of a wire are doubleda then its resistance
  11. When the ferromagnetic substance is inserted in a current- carrying solenoida the magnetic field is
  12. The direction of force o a current carrying conductor placed in a m found by
  13. Steel is hard to magnetize because of its
  14. The mass of proton is __________ the mass of an electron.
  15. Mmf in a magnetic circuit corresponds to _____ in an electric circuit
  16. What determines the atomic number of an element?
  17. A magnetic flux of 2.5 x10^4 Wb through an area of 5 x10^4 square meters results in
  18. The energy stored in an electrostatic field or electromagnetic field is called
  19. A magnetic field is
  20. A law that states that the current in a thermionic diode varies directly with the three- halves power…
  21. What is the value of the absolute permittivity of air?
  22. Calculate the flux density that will be produced by the field intensity of 2000 a. t/m for a permeability…
  23. If on looking at any one end of a solenoid; the direction of current flow is found to be clockwise then…
  24. The reluctance of a magnetic circuit is not dependent on which of the following?
  25. Electron is a Greek word for
  26. Who developed the electromagnetic theory of light in 1862?
  27. What is the SI unit of specific resistance or resistivity?
  28. An electron- volt (eV) is a unit of
  29. Electric field intensity is measured in
  30. Which of the following electric quantities is vector in character?