When a wire loop is rotated in a magnetic field the direction of the induced emf changes one in every _______ revolution



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  1. The permeability of a material having a flux density of 5 Wb/m^2 is 10^-5 H/m. What is the value of…
  2. The branch of Engineering which deals with the magnetic effect of electric current is known as
  3. Permeance of a magnetic circuit is _________ the cross-sectional area of the circuit.
  4. The temperature coefficient of resistance of conductors is
  5. The unit of flux is _____ in cgs system.
  6. All magnetic field originates from
  7. The potential at a point due to a charge is 15 V. If the distance is times, the potential at the point…
  8. The emf induced in a coil due to the changing current of another neighboring coil is called
  9. One oersted (Oe) is equivalent to _____ Gb/cm.
  10. When a conductor is stationary and the magnetic field is moving or changing the emf induced is called
  11. An alloy of 40 percent iron and 60 percent nickel.
  12. A positively charged body has
  13. Paramagnetic substance has a relative permeability of
  14. The electrons in the last orbit of an atom are called _______ electrons.
  15. How many neutrons does a copper atom have?
  16. Electric field intensity is a ________.
  17. The conduction of electricity across the surface of a dielectric is called
  18. The force of attraction or repulsion between two magnetic poles is directly proportional to their strengths.
  19. A theorem which states that an electric current flowing in a circuit produces a magnetic field at external…
  20. Which of the following materials has the least hysteresis loop area?
  21. If the length and area of cross-section of a wire are doubleda then its resistance
  22. The property of a material which opposes the creation of magnetic flux in it
  23. What is the unit of reluctance?
  24. Three charges of +5 Ca -6 C and +9 C are placed inside a sphere. What is the total flux passing through…
  25. Materials that have very high permeabilities (hundreds and even thousands times of that of free space)
  26. ______ is an electromagnet with its core in the form of a close magnetic ring.
  27. Bonding of atoms that is due to the force of attraction between positive ions and a group of negative…
  28. The force between two magnetic poles is _____ the relative permeability of the medium.
  29. Permanent magnets can be found in
  30. The permeability of permalloy is