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Which two of the following five physical parameters have the same dimensions? (A) Energy density (B) Refractive index (C) Dielectric constant (D) Young's modulus (E) Magnetic field

1. (A) and (B)
2. (C) and (E)
3. (A) and (D)
4. (A) and (E)

Correct answer: (A) and (D)

Solution

Energy density and Young's modulus both have the same dimensions, as they are both expressed in terms of energy per unit volume, which is equivalent to force per unit area (ML⁻¹T⁻²).

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