Posted by **Cynthia** on Friday, July 29, 2011 at 10:05am.

Part of a circuit has two resistors connected in parallel as shown in the figure. R(1) is a constant resistor of 10 ohm, while R(2) is a variable resistor with resistance that varies at a rate of 2 ohms per minute. The total, or effective, resistance, R, provided by this circuit is given by:

1/R=1/R(1)+1/R(2)

At what rate does the effective resistance change when R(2) is 100 ohms? Round off your answer to four decimal places.

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