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Which of the following physical quantities has dimensions that do not match the other three?
- Energy density
- Force per unit area
- Voltage multiplied by charge, divided by volume
- Angular momentum
Correct answer: Angular momentum
Solution
Energy density, force per unit area (pressure) and (voltage*charge)/volume = energy/volume all have dimensions [M L^-1 T^-2]. Angular momentum has dimensions [M L^2 T^-1], which does not match the other three.
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