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Which of the following physical quantities have the same dimensions ?

1. Electric displacement (D̄) and surface charge density
2. Displacement current and electric field
3. Current density and surface charge density
4. Electric potential and energy

Correct answer: Electric displacement (D̄) and surface charge density

Solution

Electric displacement and surface charge density both represent the distribution of electric charge per unit area, thus they share the same dimensional formula, which is essential for understanding their relationship in electromagnetism.

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