Answer: Option (b) is the correct answer.
Explanation:
When copper wire is place into the atmosphere or anywhere then there is possibility that some oxide layer or impurity must have deposited over its surface.
So, when we sanded copper wire then these impurities get removed and copper metal gets exposed onto the surface.
Thus, we can conclude that you sanded the copper wire before burning it to make sure that copper metal was exposed on the surface of the wire.
Answer:
B. to make sure that copper metal was exposed on the surface of the wire
Explanation:
Right on Edgen.
