The current ib through the base of a silicon npn transistor is 1 + 0.1 cos(10000 $\pi$t) mA. At 300 K, the r$\pi$ in the small signal model of the transistor is

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The current ib through the base of a silicon npn transistor is 1 + 0.1 cos(10000 $\pi$t) mA. At 300 K, the r$\pi$ in the small signal model of the transistor is
