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EElleeccttrroommaaggnneettiissmm:: 
TThhee EElleeccttrriicc FFiieelldd 
HHeennrryy BB.. SSeerrggiioo IIII
-Electric field is defined as tthhee eelleeccttrriicc ffoorrccee ppeerr 
uunniitt cchhaarrggee.. TThhee ddiirreeccttiioonn ooff tthhee ffiieelldd iiss ttaakkeenn ttoo 
bbee tthhee ddiirreeccttiioonn ooff tthhee ffoorrccee iitt wwoouulldd eexxeerrtt oonn aa 
ppoossiittiivvee tteesstt cchhaarrggee.. TThhee eelleeccttrriicc ffiieelldd iiss rraaddiiaallllyy 
oouuttwwaarrdd ffrroomm aa ppoossiittiivvee cchhaarrggee aanndd rraaddiiaallllyy iinn 
ttoowwaarrdd aa nneeggaattiivvee ppooiinntt cchhaarrggee.. 
EElleeccttrriicc FFiieelldd
EElleeccttrriicc FFiieelldd 
E=F/q 
Where; 
E-Electric charge 
F-Force (N) 
q-Charge (C)
SSaammppllee PPrroobblleemmss
1. How much charge experiences aa ffoorrccee ooff 55..00 xx 1100-- 
33 NN dduuee ttoo aann eelleeccttrriicc ffiieelldd ooff 1100 NN//CC.. 
22.. TTwwoo bbaalllloooonnss aarree cchhaarrggeedd wwiitthh aann iiddeennttiiccaall 
qquuaannttiittyy aanndd ttyyppee ooff cchhaarrggee:: --66..2255 nnCC.. TThheeyy aarree 
hheelldd aappaarrtt aatt aa sseeppaarraattiioonn ddiissttaannccee ooff 6611..77 ccmm.. 
DDeetteerrmmiinnee tthhee mmaaggnniittuuddee ooff tthhee eelleeccttrriiccaall ffoorrccee ooff 
rreeppuullssiioonn bbeettwweeeenn tthheemm.. 
33.. TTwwoo bbaalllloooonnss wwiitthh cchhaarrggeess ooff ++33..3377 μμCC aanndd --88..2211 
μμCC aattttrraacctt eeaacchh ootthheerr wwiitthh aa ffoorrccee ooff 00..00662266 NN.. 
DDeetteerrmmiinnee tthhee sseeppaarraattiioonn ddiissttaannccee bbeettwweeeenn tthhee 
ttwwoo bbaalllloooonnss.. 
SSeeaattwwoorrkk
MMaaggnneettiicc FFiieelldd 
-Magnetic fields are produced by electric 
currents, which can be macroscopic 
currents in wires, or microscopic currents 
associated with electrons in atomic orbits.
-similar poles repel while opposite pole 
attracts. 
MMaaggnneettiicc IInntteerraaccttiioonnss
Electric motors involve rotating coils of wire which are 
driven by the magnetic force exerted by a magnetic field 
on an electric current. They transform electrical energy 
into mechanical energy. 
EElleeccttrriicc MMoottoorr
EElleeccttrriicc MMoottoorr
EElleeccttrriicc MMoottoorr

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Electromagnetism: Electric and Magnetic Field

  • 1. EElleeccttrroommaaggnneettiissmm:: TThhee EElleeccttrriicc FFiieelldd HHeennrryy BB.. SSeerrggiioo IIII
  • 2. -Electric field is defined as tthhee eelleeccttrriicc ffoorrccee ppeerr uunniitt cchhaarrggee.. TThhee ddiirreeccttiioonn ooff tthhee ffiieelldd iiss ttaakkeenn ttoo bbee tthhee ddiirreeccttiioonn ooff tthhee ffoorrccee iitt wwoouulldd eexxeerrtt oonn aa ppoossiittiivvee tteesstt cchhaarrggee.. TThhee eelleeccttrriicc ffiieelldd iiss rraaddiiaallllyy oouuttwwaarrdd ffrroomm aa ppoossiittiivvee cchhaarrggee aanndd rraaddiiaallllyy iinn ttoowwaarrdd aa nneeggaattiivvee ppooiinntt cchhaarrggee.. EElleeccttrriicc FFiieelldd
  • 3. EElleeccttrriicc FFiieelldd E=F/q Where; E-Electric charge F-Force (N) q-Charge (C)
  • 5. 1. How much charge experiences aa ffoorrccee ooff 55..00 xx 1100-- 33 NN dduuee ttoo aann eelleeccttrriicc ffiieelldd ooff 1100 NN//CC.. 22.. TTwwoo bbaalllloooonnss aarree cchhaarrggeedd wwiitthh aann iiddeennttiiccaall qquuaannttiittyy aanndd ttyyppee ooff cchhaarrggee:: --66..2255 nnCC.. TThheeyy aarree hheelldd aappaarrtt aatt aa sseeppaarraattiioonn ddiissttaannccee ooff 6611..77 ccmm.. DDeetteerrmmiinnee tthhee mmaaggnniittuuddee ooff tthhee eelleeccttrriiccaall ffoorrccee ooff rreeppuullssiioonn bbeettwweeeenn tthheemm.. 33.. TTwwoo bbaalllloooonnss wwiitthh cchhaarrggeess ooff ++33..3377 μμCC aanndd --88..2211 μμCC aattttrraacctt eeaacchh ootthheerr wwiitthh aa ffoorrccee ooff 00..00662266 NN.. DDeetteerrmmiinnee tthhee sseeppaarraattiioonn ddiissttaannccee bbeettwweeeenn tthhee ttwwoo bbaalllloooonnss.. SSeeaattwwoorrkk
  • 6. MMaaggnneettiicc FFiieelldd -Magnetic fields are produced by electric currents, which can be macroscopic currents in wires, or microscopic currents associated with electrons in atomic orbits.
  • 7. -similar poles repel while opposite pole attracts. MMaaggnneettiicc IInntteerraaccttiioonnss
  • 8. Electric motors involve rotating coils of wire which are driven by the magnetic force exerted by a magnetic field on an electric current. They transform electrical energy into mechanical energy. EElleeccttrriicc MMoottoorr