Series-Parallel Circuits

In the given circuit, what is R_UNK equal to if R_V must be adjusted to 1,232 in order to balance the bridge?

A 220

B 6,899

C 1,232

D More information is needed in order to find R_UNK.

ANS:A - 220

In order to balance the bridge.

560/(560+100) = 1232/(1232+R).

So R = 220 ohm.

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