A point charge moves at constant speed

PHYSICS · Subjective · AP · Physics C: Electricity and Magnetism · Magnetic Fields and Electromagnetism · Magnetic Fields and Electromagnetism

Problem

A point charge moves at constant speed. If the distance from the charge to a point of observation is tripled while the charge’s speed and the relative orientation remain unchanged, by what factor does the magnitude of the magnetic field at that observation point change?

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