A single point charge produces magnetic field magnitude at point R while moving at speed

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

Problem

A single point charge produces magnetic field magnitude

B_0

at point R while moving at speed

v

, with its velocity perpendicular to the line joining the charge and R. Determine the new magnetic field magnitude at R, expressed in terms of

B_0

, if the charge’s speed is doubled at the same time that its distance from R is doubled.