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AP® Physics 1 & 2

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Magnetic Force on Wire: Magnetic Force against Gravity

APPH12-NX5ZF5

A certain metal rod has a linear mass density of 0.60 kg per meter. The rod carries an electric current of 2.0 amps through a region containing a magnetic field. The magnetic force on the rod causes it to levitate.

What is the weakest magnetic field that could be used in this experiment?

A

0.30 T

B

1.2 T

C

2.4 T

D

3.0 T