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Electromagnetism: The Magnitude and Direction of Force

Question: A wire carrying a current of 100 A due west is suspended between two towers 50 meters apart. The lines of force of the Earth's magnetic field enter the ground there in a northerly direction at a 45 degree angle; the magnitude of the field is (5 multiplied by 10`5 T). Find the magnitude and direction of the force on the wire exerted by the Earth's field.

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