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Lavi Blumberg, 6/13/11, 6/13/11, 1
Electromagnetic Induction Use the simulation “Faradays Electromagnetic Lab! "in the Electricity, #agnetism, and $ircuits section% on the &ebsite htt'(//'het)colorado)edu htt'(//'het)colorado)edu to to com'lete this 'a'er) 'a'e r)
Directions:
Bar #agnet *ab *ab + eneral #agnetism 1) $lic- on the the Bar #agnet #agnet *a *ab and you should should see a bar magnet and and com'ass on on the screen) .lease note that that the color red reers to 0orth and &hite reers to outh) .lace the com'ass at the 0orth end o the bar magnet and observe &hich &ay the “red ti'! o the com'ass 'oints) #ove the com'ass to the outh end and observe observe &here the “red ti'! o the com'ass 'oints) 2hat can you say about &here the north "red% ti' o a com'ass 'oints *he north ti' is 'ointing to&ard the south end o the magnets al&ays in the direction o the magnetic ield)
4) Use your res'onse res'onse to 51 to e'lain e'lain &hy &hy the geogra'hic geogra'hic north north 'ole is the magneti magnetic c south 'ole) *he north ti' o our com'asses 'oints to the south end o the magnet &hich is earth) 7s a result, since the com'ass 'oints north, the north 'ole must actually be the magnetic south 'ole) .ic-u' $oil *ab *ab + eneral Electromagnetic Induction 3) et the number number o loo's loo's to “1! “1! and note &hat ha''ens ha''ens to the the light light bulb &hen &hen *he magnet is not moving and is not in the loo' + 0othing *he magnet is moving and is not in the loo' + It lights u' but is very dim *he magnet is not moving and is in the loo' + 0othing *he magnet is moving and is in the loo' + It lights u' and is brighter
8) 9oes the the s'eed o the magnet aect aect your your results results to 53 I so, describe describe ho&) ho&) :es, the aster the magnet moves, the brighter the bulb is) *he slo&er the magnet, the dimmer the bulb is &hen the magnet moves) 2hen the magnet doesnt move, the light bulb remains dim ;) Increase Increase the number number o loo's to to “3! and see i it aect aects s your results results rom 53) 53) I so, describe ho&) *he bulb gets brighter &hen the magnet moves) It remains unchanged other&ise)
*ransormer *ab + $an 2e Use Electromagnetism 6) *he last tab sho&ed us that current can create a magnetic ield) $an this magnetic ield generate electricity *hat is, can &e use electricity to generate more electricity #ove the electromagnetic bac- and orth and note &hat ha''ens) :es, the electromagnet unctions
enerator *ab + .utting it 7ll *ogether >) *urn on the &ater aucet and describe &hat ha''ens) *he &ater rotates the magnet, &hich changes the magnetic lu in the coil, inducing an alternating current in the light bulb ma-ing it light u' on and o) ?) Increase and decrease the @.# o the &heel by changing the amount o &ater coming out o the aucet) 9escribe &hat ha''ens) *he aster the &ater 'ours, the brighter the light bulb lights u' and the aster the 'eriod o lighting is)
