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*Am sorry, if this topic does not belong to this section, as i am new, kindly oblige*

Can root

**RMS 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 showed

**just 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......