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home / study / science / physics / questions and answers / a uniform magnetic field exists in a circular area. ... Your question has been posted. We'll notify you when a Chegg Expert has answered. Post another question. Question Edit question 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 = 3.00 N and is perpendicular to the direction of the magnetic field, what is the magnitude of the rate at which the magnetic field is changing?

Explanation / Answer

let B be the magnetic field

AdB/dt = E.dL

A dB/dt = E . (2pixr)

AdB/dt /2pir = E

give

qE = 3uN

AdB/dt /2pir = 3uN/q

dB/dt = 0.000047123/A

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