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A uniform magnetic field exists in a circular area. A particle carrying charge q = 8.0...

A uniform magnetic field exists in a circular area. A particle carrying charge q = 8.0 mC is placed in the field a distance rp = 20 mm from the center of the circular area.

If the particle experiences a force that has magnitude F = 4.00 μN and is perpendicular to the direction of the magnetic field, what is the magnitude of the rate at which the magnetic field is changing?

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