Magnetism And Electromagnetism Multiple Choice Questions and Answers

16.  The attraction capacity of electromagnet will increase if the

   A. Core length increases

   B. Core area increases

   C. Flux density decreases

   D. Flux density increases

17.  Temporary magnets are used in

   A. Loud speakers

   B. Generators

   C. Motors

   D. All of the above

18.  Which of the following materials are diamagnetic?

   A. Silver

   B. Copper

   C. Silver and copper

   D. Iron

19. Unit for quantity of electricity is

   A. Ampere-hour

   B. Watt

   C. Joule

   D. Coulomb

20.  Magnetism of a magnet can be destroyed by

   A. Heating

   B. Hammering

   C. By inductive action of another magnet

   D. All the above methods

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