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step 2 of 5 on question 11.28 of electric circuits, why does the sign of the...

step 2 of 5 on question 11.28 of electric circuits, why does the sign of the angle go from negative, to positive, to negative again? Electric circuits 11th edition By Nilsson & Riedel

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The sign of angle go from negative when capacitive load is increased. Similarly the sign of angle go from negative to positive when inductive load is increased.

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