Question

copper is the most commonly used conductor. why?

Answer 1

Look here


It is the best conducter of electricity and heat just after silver!!
And we know that ,we can't use silver as any wire or heating material, because it is very costly, we use copper!!!

got it!!!!

Answer 2

Copper is the most commonly used conductor
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1)it is the second best conductor after silver
2)it is not as costly as silver and is found more 
3)it has very low resistance dude to which the current wont get wasted 
4)it is very good conductor of electricity