A 20.0-m-long cable consists of a solid-inner, cylindrical, nickel core 12.0 cm in diameter surrounded by a solid-outer cylindrical shell of copper 12.0 cm in inside diameter and 24.0 cm in outside diameter The resistivity of nickel is 7.8 x 10-8 2. m. Part A What is the resistance of this cable? 15. ΑΣΦ R = 9.24 Submit Previous Answers Request Answer Part B * Incorrect; Try Again; 4 attempts remaining ? 15. ΑΣΦ If we think of this cable as a single material, what is its equivalent resistivity? 152 ?

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Microscopic view of current

In physics, the term current is expressed as the rate of flow of electric charges across the area per unit time (I=q/t). It propagates along in the direction of the motion of positive charges. When the current is caused by the motion of electrons, the direction of the current is opposite to the flow.