question_answer

The electrical resistivity of some substances are given below. Which of the following substances can be used to reduce the current in an electric circuit?

A) \[0.6\times {{10}^{-8}}\] ohm metre

B) \[49\times {{10}^{-8}}\] ohm metre

C) \[1.6\times {{10}^{-8}}\] ohm metre

D) \[1.63\times {{10}^{-16}}\] ohm metre

E) None of these