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The unit of electrical energy is

A. Joule

B. Watt- second

C. Kilowatt hour

D. All of these

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  1. The unit of flux is _____ in cgs system.
  2. Bonding of atoms that is due to the force of attraction between positive ions and a group of negative…
  3. The temperature coefficient of resistance of eureka is
  4. It is the reciprocal of reluctance and implies the case of readiness with which magnetic flux is developed.
  5. The magnetic field around the conductor is determined by the
  6. If two similar charges 1 coulomb each are placed 1 m apart in aira then the force of repulsion is
  7. The magnetic materials should have a large hysteresis loss for one of the following applications.
  8. The temperature coefficient of resistance of insulators is
  9. 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…
  10. The temperature coefficient of resistance of a conductor ______ with an increase in temperature.
  11. The emf induced in a coil due to the changing current of another neighboring coil is called
  12. What is the SI unit of magnetic flux?
  13. When the relative permeability of a material is much greater than 1a it is called _______ material.
  14. The electric potential at a point in air due to a charge is 21 V. If the air is replaced by a medium…
  15. Under ordinary conditionsa a body is considered
  16. __________ is a substance of whose molecules consist of the same kind of atom.
  17. What solid has no defined crystal structure except perhaps in the arrangement of the nearest neighboring…
  18. Who demonstrated that there are magnetic effects around every current-carrying conductor and that current-carrying…
  19. Which of the following materials has permeability slightly less than that of free space?
  20. Refers to the non- metallic materials that have the ferromagnetic properties of iron.
  21. This paper does not exhibit electricity because it contains the same number of
  22. If the right handed bottle-opener cork screw is assumed to be along the conductor so as to advance in…
  23. A length of wire has a resistance of 10 ohms. What is the resistance of a wire of the same material…
  24. Electronic current in a wire is the flow of ____________ electrons.
  25. A law establishing the fact that the algebraic su of the rises and drops of the mmf around a closed…
  26. The ratio of the total flux (flux in iron path) to the useful flux (flux in air gap)
  27. Hysteresis loss can be reduced by one of the following.
  28. Who discovered superconductivity in 1911?
  29. A substance that attracts pieces iron
  30. States that the ratio of the thermal conductivity is proportional to the absolute temperature for all…