Question

Choose the correct circuit which can achieve the bridge balance.

• A.

  

• B.

  

• C.

  

• D.

  

Answer 1

The Correct Option is A

In option (1)

To Balance Bridge

$$ \frac{P}{Q} = \frac{R}{S} $$

Here

$$ P = 10 \ \Omega $$

$$ Q = 10 \ \Omega $$

$$ R = 15 \ \Omega $$

$$ S = 5 + R_{diode} $$

The diode can conduct and have resistance R_D=10Ω because diode have dynamic resistance. In that case bridge will be balanced.