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. An alloy of 22 percent iron and 78 per cent nickel.
  2. The electric potential at a point in air due to a charge is 21 V. If the air is replaced by a medium…
  3. A 200-watt lamp working for 24 hours will consume approximately _____ units.
  4. The core of a transformer heats up when its primary is fed from an ac source because of
  5. One of the common application of an air- cored choke.
  6. What is the value of the absolute permittivity of air?
  7. The resistivity of a conductor ___________ with an increase in temperature.
  8. Who demonstrated that there are magnetic effects around every current-carrying conductor and that current-carrying…
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  16. The point in a magnet where the intensity of magnetic lines of force is maximum
  17. Permanent magnets can be found in
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  20. How much is the flux in Weber in the above problem?
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  23. The uncharged particles which have no effect on its atomic charge.
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  28. Who discovereda the relationship between magnetism and electricity that serves as the foundation for…
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