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Electricity and Magnetism


19. 

Electric current in the flow of

Answer : B. free electrons

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20. 

An example of semi-conductor is

Answer : B. Germanium

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21. 

which of the following can be made into a permanent magnet?

Answer : B. hard steel

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22. 

Which metal is commonly used for making an electromagnet?

Answer : B. Iron

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23. 

On adding a little antimony to germanium,we get

Answer : B. n-type semiconductor

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24. 

The magnetic effect of elctric current was first observed by

Answer : B. Oersted

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