Magnetic Field of a Moving Point Charge

q v × r r2. (2) Force F1 exerted by field B on point charge q1: F1 = q1v1 × B. (1+2) There is a time delay between causally related events over distance.
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Magnetic Field of a Moving Point Charge moving electric charge

generates

magnetic field

moving electric charge

exerts force locally

exerts force over distance

~ generated by point charge q: B ~ = µ0 q~v × rˆ (1) Magnetic field B 4π r2 ~1 exerted by field B ~ on point charge q1 : F ~1 = q1~v1 × B ~ (2) Force F (1+2) There is a time delay between causally related events over distance. field point

• Permeability constant µ0 = 4π × 10−7 Tm/A

r

B

^ q r v + source point

tsl210 – p.1/1