JEE Main 2025 — Electrostatics Question with Solution

Step 1: Formula for Potential Difference
The potential difference ($$\Delta V$$) between two points in a uniform electric field is found by multiplying the electric field ($$E$$) by the distance ($$\Delta d$$) between the points: $$\Delta V=E\times \Delta d$$

Step 2: Find the Electric Field
The total potential difference between the two plates is $$V$$, and they are 10 cm apart. So, the electric field between the plates is: $$E=\frac{V}{10}$$ Here, distance is in centimeters.

Step 3: Calculate Potential Difference Between A and B
Points A and B are 4 cm apart. So, the potential difference between A and B will be: $$V_{AB}=E\times 4=\frac{V}{10}\times 4=\frac{4V}{10}=\frac{2V}{5}$$