Question

A nichrome wire is 1 m long and 1 x
10-6 m2 in cross-sectional area.
When connected to a potential
difference of 2 V, a current of 4 A
exists in the wire. The resistivity of
this nichrome is​

Answer 1

Explanation:

Resistance = (Resistivity × Length)/ Area. ....... (1)

Also, Resistance = (Potential Difference)/ Current .......(2)

So, From eq(1) and eq(2) , We can say that..

(Resistivity × Length)/ Area = (Potential Difference)/ Current

=> (Resistivity × 1)/ (1× 10^-6) = 2/4

=> Resistivity = 1/2 × 1×10^-6

thus, Resistivity = 5 × 10^-6 ohm - m.

Answer 2

Answer:

correct answer is 5x10^-7 not -6 to be exact

Explanation: