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The magnetic field of a magnetized iron bar when strongly heated

A. Becomes weaker

B. Becomes stronger

C. Reverses in direction

D. is unchanged

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  1. Which of the following is a natural magnet?
  2. Theory of ferromagnetic phenomena which assumes each atom is a permanent magnet which can turn freely…
  3. The potential at a point due to a charge is 15 V. If the distance is times, the potential at the point…
  4. What is the typical saturation flux density for most magnetic materials?
  5. Calculate the permeability (in T/A. t/m) of a magnetic material that has a relative permeability of…
  6. Under ordinary conditionsa a body is considered
  7. A magnetic material losses its ferromagnetic properties at a point called
  8. The temperature coefficient of resistance of insulators is
  9. One of the solid structures in which the position of the atoms or ions are predetermined
  10. Flux linkages equals
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  12. A substance that attracts pieces iron
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  14. Formed when there exist distant electronic interactions between (opposite) charges present in the neighboring…
  15. Hysteresis refers to the ______ between flux density of the material and the magnetizing force applied.
  16. Used to maintain strength of magnetic field
  17. The ratio of the permeability of material to the permiabiity of air or vacuum.
  18. The magnetic flux through a coil changes. This results to the induced emf acting in a direction as to
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  20. The emf produced in a wire by its motion across a magnetic field does not depend upon the
  21. The quantity of magnetism retained by a magnetic material after withdrawal of the magnetizing force…
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  25. How much is the flux in Weber in the above problem?
  26. If on looking at any one end of a solenoid; the direction of current flow is found to be clockwise then…
  27. What is the relative permittivity of air?
  28. Which of the following electric quantities is vector in character?
  29. How is mutual inductance between two coils decreased?
  30. Referred to as the specific reluctance of a material