Table gives the resistivity of three material in ohm A, B, C Sample a

1.	Table gives the resistivity of three material in ohm A, B, C Sample a of resistivityA is 1.6 into 10 to the power minus 8 and resistivity of B is 7.5 into 10 to the power 17and resistivity of C is 44 into 10 to the power minus 6 which one of them is the best conductor and which is an insulator and why? A wire of resistivity P is stretched to twice its length what will be its new resistivity?
Answer» Explanation: (i)The lesser the resistivity of a CONDUCTOR ,the more it allows electric current to pass through it . Insulators have the maximum resistivity and conductors have the minimum resistivity. In the given question the best conductor will be the one having minimum resistivity. So, material A is the best conductor , SINCE it has minimum resistivity. AND, Material B the best INSULATOR since it has maximum resistivity. (ii)Resistivity of a conductor does not depend on its length . If the length of the conductor is increased twice ,the resistivity will remain constant. It will not change. Hence, after doubling the length of the given wire, resistivity will be P only.

Table gives the resistivity of three material in ohm A, B, C Sample a of resistivityA is 1.6 into 10 to the power minus 8 and resistivity of B is 7.5 into 10 to the power 17and resistivity of C is 44 into 10 to the power minus 6 which one of them is the best conductor and which is an insulator and why? A wire of resistivity P is stretched to twice its length what will be its new resistivity?

Answer»

Explanation: