The simplest type of atom to exist is the ______ atom.

A. Helium

B. Hydrogen

C. Boron

D. Oxygen

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  1. The phenomenon by which a magnetic substance becomes a magnet when it is place near a magnet
  2. The ratio of the total flux (flux in iron path) to the useful flux (flux in air gap)
  3. The physical motion resulting from the forces of magnetic fields is called
  4. The emf induced in a coil due to the change of its own flux linked with it is called
  5. One of the solid structures in which the position of the atoms or ions are predetermined
  6. Small voltages generated by a conductor with current in an external magnetic field.
  7. A positively charged body has
  8. Defined as a closed path in which magnetic induction or flux flows
  9. The emission of electrons from hot bodies is called
  10. Materials that have very high permeabilities (hundreds and even thousands times of that of free space)
  11. One that has magnetic poles produced by internal atomic structure with no external current necessary
  12. Which of the following is used by temporary magnets as the magnetic material?
  13. If two similar charges 1 coulomb each are placed 1 m apart in aira then the force of repulsion is
  14. Core materials of a good relay have _________ hysteresis loop.
  15. There are how many compounds available in nature?
  16. The B-H curve of ________ is not a straight line.
  17. Temporary magnets are commonly employed in
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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
  19. The magnetic flux through a coil changes. This results to the induced emf acting in a direction as to
  20. Defined as the ratio of the volume occupied by the atoms or ions in a unit cell divided by the volume…
  21. A magnetic flux of 2.5 x10^4 Wb through an area of 5 x10^4 square meters results in
  22. Paramagnetic substance has a relative permeability of
  23. The temperature coefficient of resistance of conductors is
  24. Defined as the number of lines per unit area through any substance in a plane at right angles to the…
  25. What principle states that each electron in an atom must have a different set of quantum numbers?
  26. Who discovereda the relationship between magnetism and electricity that serves as the foundation for…
  27. Electrons at the outer shell are called
  28. Back emf refers to the
  29. Who demonstrated the theory of electromagnetic induction in 1831?
  30. The branch of Engineering which deals with the magnetic effect of electric current is known as