Q.

An alternating voltage  v(t)=220sin100πt volt is applied to a purely resistive load  of 50Ω .The time taken for the  current  to rise from half of the peak value to the peak value is  (in milli-second)

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answer is 3.33.

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Detailed Solution

As V(t)=  220sin100πtSo, I(t)=  22050sin   100πti.e; I= Imsin(100πt)For I= Im t1=π2×1100π=1200secAnd for I= Im2⇒Im2=Imsin(100πt2)⇒t2=1600s∴treq=1200−1600=2600=1300s=3.33ms
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