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Series-Parallel Circuits - Engineering

Q1:

A certain Wheatstone bridge has the following resistor values: R1 = 10 k, R2 = 720 , and R4 = 2.4 k. The unknown resistance is

A 24 

B 2.4 

C 300 

D 3,000 

ANS:D - 3,000 

Wheatstone bridge.
R1R2=R3R4.

Here unknown resistance is R3.
So,
R3 = R1R2/R4.
= 10000 * 720/2400.
R3 = 3000 ohm.