question_answer

What will be the length of wire to make its resistance of 15 ohms, if copper wire has a diameter of 1 mm and resistivity of \[1.5\times {{10}^{-8}}\] ohm metre?

A) 700 m              

B) 785.7 m

C) 600 m                          

D) 685.7 m

E) None of these