NEET 2008 Physics question
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
Answer: (4)
Solution
Energy density = energy / volume, so its dimensions are . Young's modulus = stress / strain = force per unit area (strain is dimensionless), so its dimensions are also . Hence (a) and (d)
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