Electro Magnetic Induction And Alternating Currents Question 81

Question: If instantaneous current is given by $ i=4\cos ,(\omega ,t+\varphi ) $ amperes, then the r.m.s. value of current is [RPET 2000]

Options:

A) 4 amperes

B) $ 2\sqrt{2} $ amperes

C) $ 4\sqrt{2} $ amperes

D) Zero amperes

Show Answer

Answer:

Correct Answer: B

Solution:

$ {i_{r.m.s.}}=\frac{i_{o}}{\sqrt{2}}=\frac{4}{\sqrt{2}}=2\sqrt{2}\ ampere $



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