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# Magnetic Field and Circular Regions

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In a circular region of radius r1 there is a uniform magnetic field coming out of the page and decreasing at a constant rate dB/dt = -K. A circular wire loop of radius r2 lies entirely outside the magnetic field region. In what direction does the conventional current I flow in the loop? What is the magnitude of I? Draw the induced (non-Coulomb) electric field in the loop. What is its magnitude?

https://brainmass.com/physics/coulombs-law/magnetic-field-circular-regions-11181

#### Solution Preview

1. Use Biot Savert's law.

dB = (U0/4 * pi) I * dt/ r1 since r2 doesn't fall in the region of magnetic ...

#### Solution Summary

In a circular region of radius r1 there is a uniform magnetic field coming out of the page and decreasing at a constant rate dB/dt = -K. A circular wire loop of radius r2 lies entirely outside the magnetic field region. In what direction does the conventional current I flow in the loop? What is the magnitude of I? Draw the induced (non-Coulomb) electric field in the loop. What is its magnitude?

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