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Networks Analysis and Synthesis - Engineering

Q1:

A circuit is fed by two sources of the same frequency and values 100 ∠0° V and 20 ∠30°V. The current in a particular branch is 5 ∠19° A. If the magnitudes of the sources and changed to 200 ∠0° V and 40 ∠30° V, the current in that branch should be

A 5 ∠19° A

B 10 ∠19° A

C 10 ∠38° A

D 10 ∠9.5° A

ANS:B - 10 ∠19° A

Since strengths of both sources are doubled, the current would become twice.