The magnetic field in a EM wave traveling in free space has an rms strength of...

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The magnetic field in a EM wave traveling in free space has an rms strength of...

The magnetic field in a EM wave traveling in free space has an rms strength of 21.1 nT .
Part A
How long does it take to deliver 375 J of energy to 1.00 cm2 of a wall that it hits perpendicularly?
Express your answer using three significant figures.

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