# Problem 9.5 Part A At t 5 ms, a sinusoidal current is known to be zero... Problem 9.5 Part A At t 5 ms, a sinusoidal current is known to be zero and going negative. The current is next zero at 40 ms. It is also known tiat the current is 50 mA at t-0 What is the frequency of i in hertz? Express your answer using three significant figures Submit Reauest Answer Part B What is the expression for 115sin(28,Gat 64.3) mA 15sin(28.6t 64.3) mA 115cos(28.6rt:64.3) niA 15cos(28.6t 643) mA Submi  #### Earn Coin

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