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Unformatted text preview: t = 0.2 s and is going positive at that point, meaning that v ( t ) > 0 for t = 0.21 s. Furthermore, the voltage at t = 0 is -28 mV and its next zero is at t = 8.2 s. (a) What is the frequency of the voltage source in kHz? (b) Write the expression for v ( t ), as a cosine. 4. U&M 5.30. 5. U&M 7.11 (d) and (e) 6. U&M 7.15 (b) and (f) 7. U&M 7.21...
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