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n unusual lightning strike has a vertical portion with a positive current of +400 A upwards....

n unusual lightning strike has a vertical portion with a positive current of +400 A upwards. The Earth's magnetic field at that location is parallel to the ground and has a magnitude of 30 x 10-6 T. In N, the force exerted by the Earth's magnetic field on the 25 m-long current is

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Hag.nehc bield B = 30x106T F (30x166)(400) (.5)

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