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At a particular place on the surface of the Earth, the Earth's magnetic field has magnitude of 5.45 x 10-5 T, and there is also a 128 V/m electric field perpendicular to
the Earth's surface.
(a) Compute the energy density of the electric field. (Give your answer in nJ/m³.)
nJ/m³
(b) Compute the energy density of the magnetic field. (Give your answer in μJ/m².)
µJ/m³

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