Question

Find the resistance of 0.1 km long copper wire if the radius of the cross section of the wire is 0.1mm . Take the resistivity 1.7 * 10 ojhm​

Answer 1

Answer:

Resistance= Resistivity×length/ area

Explanation:

Resistance= ?

length=0.1km {0.1×1000}m

radius= 0.1mm change it into m

then radius= 0.1×10^3

resistivity=1.7

Resistance= 1.7×0.1×1000/π×0.1×0.1×1000000

π=3.14

Resistance=0.5414 ohm