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Can rootRMS value of current(what we study in Alternating currents) be negative?

i feel that it can surely be negative as it is a root, but my teacher told that it can't be negative and showedjust one line above x axis. When asked he told me that it's a root of mean of square, hence can't be negative. i did not understand, kindly help......

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# Homework Help: Root mean square current

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