Earths magetic field is horizontal to the north
A negative ion is moving east near the equator where the Earth's magetic field is horizontal to the north. The direction of the magnetic force on the ion is.
A. North
B. South
C. Up
D. Down
E. Not meaningful since the force is zero
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A copper wire with a resistance of 4.00Ω at 20.0o C has a length of 5.00 m. If it is to have the same resistance and cross sectional area at 40.0o C to what length must it be cut?
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