If a cable carrying a 52A current is suspended 7

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If a cable carrying a 52A current is suspended 7.8m above the ground, and a 1.7m tall person walks directly under it, calculate the magnetic field -created by the current in the cable- at the location of the person's head, and compare it to the strength of Earth's magnetic field. (calculate Bcable/BEarth to two decimal places. BEarth= 50 uT