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electronics and communication engineering networks analysis and synthesis
1. An RL series circuit has an impedance of 20 Ω when frequency is 25 Hz. At f= 50 Hz, the impedance will be
(A): 20 Ω
(B): 40 Ω
(C): less than 20 W but more than 10 Ω
(D): less than 40 W but more than 20 Ω
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By: guest on 02 Jun 2017 01.06 am
Z = R2 + XL2 . When frequency is doubled, XL becomes twice but R remains the same.
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