If instantaneous current is given by \[i=4\cos \,(\omega \,t+\varphi ) – McqOptions

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1.	If instantaneous current is given by \[i=4\cos \,(\omega \,t+\varphi )\] amperes, then the r.m.s. value of current is [RPET 2000]
A.	4 amperes
B.	\[2\sqrt{2}\] amperes
C.	\[4\sqrt{2}\] amperes
D.	Zero amperes
Answer» C. \[4\sqrt{2}\] amperes

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