Question

If two resistors with resistances R1 and R2 are connected

in parallel, as in the figure, then the total resistance R , measured in ohms (Ω ), is given by

1/R= 1/R1 +1/R2

If R1 and r2 are increasing at rates of 0.3 Ω/s and 0.2 Ω/s ,

respectively, how fast is R changing when R1 = 80Ω/s and R2 =100Ω

?

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