Current Electricity
The resistance of a copper wire 200 m long is 21 ω. If its thickness (diameter) is 0.44 mm, its specific resistance is around

1.8 x 10-8 ω-m
1.4 x 10-8 ω-m
1.2 x 10-8 ω-m
1.6 x 10-8 ω-m

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Current Electricity
In the case of direct current

Magnitude of current remains constant
Magnitude of current changes with time
Magnitude and direction of current changes with time
Magnitude and direction of current remains constant

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