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

What of the following indicates the weakest magnetic field that could be used in this experiment?

A

$0.30\text{ T}$

B

$1.2\text{ T}$

C

$2.4\text{ T}$

D

$3.0\text{ T}$

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