The resistance of a wire is 50ohm at 20°C. If the length and diameter of the wire are 1m and 5 x 10-⁴m respectively,
calculate the resistivity of the material of the wire.​

Why is alternating current more effective at long–distance travel than direct current? a. the power lines are made out of conductors. b. transformers increase or decrease voltage as needed. c. the ac generator is more efficient. d. ac has lower voltage than dc.

Which fators influence ocean currents

Distinguish between a transverse wave and a longitudinal wave.