• November 21, 2021

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• PHY102 Physics II © Dr.Cem Özdoğan

• Magnetic Field Direction

• B

• +

• –

• Compare to Electric
• Field Directions

• E

• Electric fields are created:
• microscopically, by electric charges (fields) of elementary particles (electrons, protons)
• macroscopically, by adding the field of many elementary charges of the same sign
• Magnetic fields are created :
• microscopically, by magnetic “moments” of elementary particles (electrons, protons, neutrons)
• macroscopically,
• by adding many microscopic magnetic moments (magnetic materials),
• by electric charges that move (electric currents).

• 28-2 What Produces a Magnetic Field?

FROM North Poles TO South Poles