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ollegr [7]
1 year ago
15

Which statement is true of a mechanical wave?

Physics
1 answer:
svet-max [94.6K]1 year ago
7 0
It must have a medium. It must travel in empty space. Mechanical waves are waves which needs medium of propogation.
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Answer:

electric field E = (1 /3 e₀) ρ r

Explanation:

For the application of the law of Gauss we must build a surface with a simple symmetry, in this case we build a spherical surface within the charged sphere and analyze the amount of charge by this surface.

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     Q ’= ρ V '

The volume of the sphere is V = 4/3 π r³

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The symmetry of the sphere gives us which field is perpendicular to the surface, so the integral is reduced to the value of the electric field by the area

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Now you relate the fraction of load Q ’with the total load, for this we use that the density is constant

     

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How you want the solution depending on the density (ρ) and the inner radius  (r)

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      E = (1 /4π ε₀) (1 /r²) ρ 4/3 π r³

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3 years ago
If you change the magnetic field in a closed loop of wire You induce in the loop a(n) A. current. B. voltage. C. electric field.
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