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Suppose a straight 1.65 mm -diameter copper wire could just "float" horizontally in air because of...

Suppose a straight 1.65 mm -diameter copper wire could just "float" horizontally in air because of the force due to the Earth's magnetic field B⃗ , which is horizontal, perpendicular to the wire, and of magnitude 4.5×10−5 T .

A)

What current would the wire carry?

Express your answer using two significant figures.

B)

Explain briefly.

Essay answers are limited to about 500 words (3800 characters maximum, including spaces).

science   physics   
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