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A thin 2.09 m long copper rod in a uniform

magnetic field has a mass of 40.6 g. When

the rod carries a current of 0.229 A directed

perpendicular to the magnetic field, it floats

in the magnetic field.

The acceleration of gravity is 9.81 m/s²

.

What is the field strength of the magnetic

field?

Answer in units of T ...?