Chapter_21 - Electric charge, Coulomb's Law Responsible for...

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Electric charge, Coulomb’s Law Responsible for sections 1-6
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Overview of course • An electric charge in an electric field experiences a force (Chpt. 21) F E = q E • where vectors are bold • A moving charge in a magnetic field experiences a force (Chpt. 27) F B = q v × B Memorize
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Sources of electric and magnetic fields Maxwell’s equations • Electric charge creates conservative electric field E (Chpts. 21 and 22) • Magnetic monopoles do not exist (Chpt. 29) • Changing magnetic flux creates non-conservative E field (Chpt. 29) • Moving charge and changing electric flux create magnetic field B (Chpts. 27, 28, and 29)
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Electric charge • Neutral atom consists of an equal number of negatively charged electrons and positively charged protons • Two charges repel if they have the same charge (both positive or both negative) • Two charges attract if they have opposite charge (one positive and one negative)
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Electric fields Net positive charge E Net negative charge E
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Force on charge q > 0 in the electric field E Net positive charge F = q E q Net negative charge F = q E q Reverse the direction of F if q < 0
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Electric field E created by a point charge q 1 >0 + q 1 E r q 1 E E = kq 1 /r 2 Memorize k = 9.0 × 10 9 N-m 2 /C 2 r
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Chapter_21 - Electric charge, Coulomb's Law Responsible for...

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