Electro Magnetic Induction And Alternating Currents Question 139
Question: The voltage of an ac supply varies with time $ (t) $ as $ V=120\sin 100\pi t\cos 100\pi t. $ The maximum voltage and frequency respectively are [MP PMT 2001; MP PET 2002]
Options:
A) 120 volts, 100 Hz
B) $ \frac{120}{\sqrt{2}} $ volts, 100 Hz
C) 60 volts, 200 Hz
D) 60 volts, 100 Hz
Show Answer
Answer:
Correct Answer: D
Solution:
$ V=120\sin 100\pi t\cos 100\pi t $
$ \Rightarrow V=60\sin 200\pi t $
$ {V_{\max }}=60V $ and $ \nu =100Hz $
