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A question. What is the formula for calculaing w0 (w at resonance) in a two-branch parallel circuit consisting of:

A voltage source

branch 1: R1 + L (in series)

branch 2: R2 + C (in series)

I thought it was the same as RLC series, but it actually is pretty different.

BTW I got a parallel resonance exercise but cannot figure out how to solve it.

Same circuit as above, but:

r1 = 2 ohm

r2 = 5 ohm

C = -10j ohm

W = 5000 radian

Find out the value of L (both in ohms and Henry)

Any help on this subject is really appreciated.