A 10 m long potentiometer wire carries a steady current. A standard cell of emf 1.018 V is balanced against a length of 254.5 cm of the wire. What is the potential gradient across the potentiometer wire ?

Explanation

To find the potential gradient across the potentiometer wire, we can follow these steps:

### Step 1: Understand the given data
- Length of the potentiometer wire, \( L = 10 \, \text{m} = 1000 \, \text{cm} \)
- EMF of the standard cell, \( E = 1.018 \, \text{V} \)
- Length of the wire balanced against the standard cell, \( l = 254.5 \, \text{cm} \)

### Step 2: Use the formula for potential gradient
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