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


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D. Flux density increases

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17.  Temporary magnets are used in


   A. Loud speakers

   B. Generators

   C. Motors

   D. All of the above


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D. All of the above

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18.  Which of the following materials are diamagnetic?


   A. Silver

   B. Copper

   C. Silver and copper

   D. Iron


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C. Silver and copper

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19. Unit for quantity of electricity is


   A. Ampere-hour

   B. Watt

   C. Joule

   D. Coulomb


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D. Coulomb

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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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D. All the above methods

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