A two-conductor cable is connected at one end so that a current I flows through

Question

A two-conductor cable is connected at one end so that a current I flows through the conductors. The current flows up one conductor and back down the other. A segment of the cable is drawn to the right. What is the net current flowing through a ring whose boundary encircles both conductors? 0 I 2I 4I I/2 A potential difference V is established across a wire of resistance R drawing a power P from the circuit. If the resistance is doubled while the potential difference remains the same, what is the new power in term of the original power P? P 2P 4P P/2 P/4

Explanation / Answer

1) net current = I

2) POWER P = V^2/R

     V is constant and resistance r is doubled

then power is.............. P/2

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