Question

Choose the correct circuit which can achieve the bridge balance.

• A.

  

• B.

  

• C.

  

• D.

  

Answer 1

The Correct Option is A

Option (1): Bridge Balance Condition

To achieve a balanced bridge:

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

Given:

$$ P = 10 \ \Omega $$

$$ Q = 10 \ \Omega $$

$$ R = 15 \ \Omega $$

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

A diode with dynamic resistance $R_D = 10 \ \Omega$ can conduct. Under this condition, the bridge will be balanced.