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A first-order circuit, having a gain of 10 at dc

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A first-order circuit, having a gain of 10 at dc and a gain of 1 at infinite frequency, has its pole at 20 kHz. Find its transfer function.
a. (s + 4pi x 105) / ( s + 4pi x 104)
b. (s + 4pi x 104) / ( s + 4pi x 103)
c. (s + 2pi x 105) / ( s + 2pi x 104)
d. (s + 2pi x 104) / ( s + 2pi x 103)

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