(1.) Given a resistance of 5M. what capacitance value is required to have a time

Question

(1.) Given a resistance of 5M. what capacitance value is required to have a time constant of 2s ?

(2.) An equipotential surface in three dimensions for the potential function is represented by: V = y2 - x2 - Z. Find the the function for the electric field for this potential.

(3.) A high voltage transmission line that connects a city 500 km away from a power plant consists of a pair of copper wire, each with a resistance of 4. The current flows to the city along one wire, and back along the other.

(a.) the transmission line delivers to the city 1.7*105 kW of power at 2.3*105 V. What is the current in the transmission line? How much power is lost as joule heat in the transmission line ?

(b.)if the transmission line were to deliver the same power 1t 110 V, how much power would be lost as joule heat? is it ore efficient to transmit at high voltage or at low voltage?

Explanation / Answer

=RC

C=/R=2/5=0.4F

2) E=-dv/dr=v/x+v/y+v/z=-(-2x+2y-2z)

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