An unusual lightning strike has a vertical portion with a current of ?400 A downwards. The Earth's magnetic field at that location is parallel to the ground and has a magnitude of 30 ?T. In N, the force exerted by the Earth's magnetic field on the 25 m-long current is
A. 0.
B. 0.012 N, East.
C. 0.012 N, West.
D. 0.30 N, West.
E. 300 N, East.
Answer: D
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Fill in the blank(s) with correct word
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