A magnetic field and an electric field in separate regions, Ask an Expert

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A magnetic field and an electric field, in separate regions of space, have strengths of 1.25 T and 1.25 N/C, respectively.

(a) What is the energy density of the magnetic field?

(b) What is the energy density of the electric field?

(c) If the magnetic and electric field strengths are doubled, in each case what is the ratio of the new energy density to the old one? (The answer is the same whether you consider the magnetic or the electric field.)

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