Which two of the following five physical parameters have the same dimensions? (1) Energy density (2) Refractive index (3) Dielectric constant (4) Young's modulus (5) Magnetic field
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Question

Which two of the following five physical parameters have the same dimensions? (1) Energy density (2) Refractive index (3) Dielectric constant (4) Young's modulus (5) Magnetic field

G1 Physics · Accepted Answer

Step 1: Energy density = energy/volume = [M L⁻¹T⁻²]. Step 2: Young's modulus = stress/strain; strain is dimensionless, so Young's modulus also has [M L⁻¹T⁻²]. Step 3: Thus 1 and 4 have the same dimensions. Final: Option C.