निम्नलिखित परिपथ का शक्ति गुणांक होगा:
`R= 40 Omega`

Options

A. 0.2
B. 0.4
C. 0.6
D. 0.8

Answer

D

Explanation

`Z = sqrt(R^(2) + (X_(L) - X_(c))^(2))`
`rArr Z = sqrt((40 + 40)^(2) + (100 - 40)^(2)) = 100 Omega`
`rArr cos phi = R/Z = 80/100 = 0.8`