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Question

A physical quantity S is defined as S=(E×B)/μ0, where E is electric field, B is magnetic field and μ0 is the permeability of free space. The dimensions of S are the same as the dimensions of which of the following quantity(ies) ?

A
Energycharge×current
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B
ForceLength×Time
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C
EnergyVolume
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D
PowerArea
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Solution

The correct option is D PowerArea
S=[E×B]μ0

Here, S is the Poynting vector which denotes flow of energy per unit area per unit time, which is energy flux or intensity.

S=EnergyTime-Area or ForceTime- Length

So, unit of S is Wattm2.

And here, options (B) and (D) have same unit, so these two are the correct options.

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