State the underlying princeiple of mater bridge. Draw the circuit diagram and explain how the unknown resistance of a conductor can be determined by this method.

Explanation

### Step-by-Step Solution

**Step 1: State the Underlying Principle of Meter Bridge**
The underlying principle of the meter bridge is based on the Wheatstone bridge principle. It is used to determine the unknown resistance by balancing two legs of a bridge circuit.

**Step 2: Draw the Circuit Diagram**
The circuit diagram of a meter bridge consists of a one-meter long uniform wire (AC) connected to a galvanometer (G) and a jockey (J). Two gaps are formed where the unknown resistance (R) and a known resistance (S) are connected. The circuit can be represented as follows:

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