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Q.

Is it true that the current in a solid conductor is due to motion of free electrons in it?


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a

True           

b

False 

answer is A.

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Detailed Solution

The above statement is true.
A metallic conductor contains a lot of free electrons. When a potential difference is applied across the ends of a metallic wire, free electrons begin to drift from the low to high potential region. These electrons come into contact with the positive ions (the atoms which have lost their electrons).
The flow of electrons produces an electric current in conductors. In an electric circuit, the direction of electric current is traditionally the opposite direction of electron flow.
 
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Is it true that the current in a solid conductor is due to motion of free electrons in it?