Guide

Comparethearrangementofonebatteryandtwobatteries
(connectedinseries).Countthenumberofironbarsonthe
ironcore,andwriteitdowninthetableonnextpage.
Warning
200-turncoil
Anironcore
Sandpaper
4ｃｍ
200-turncoil
100-turncoilwithironcore
Connectingplug
100-turncoilwithironcore
Connecting
plug
Anironcore
DonotkeeptheswitchturnedON.
Theelectromagnetwillbecome
veryhot.Takethebatteryout
aftertheexperimentisfinished.
Turn
ON!
Turn
ON!
Turn
ON!
Checkbychangingthenumberofbatteries
Checkbychangingthenumberofturnsonthecoil.
Onebattery Twobatteries
Buffbothsidesoftheenameledwireonthe
200-turncoilwithsandpaperuntilyoustrip
offabout4cmofthesurface.
Windoneendoftheenameled
wiresaroundthebobbinstopper.
Connectthe100-and200-turncoilsasshownonthe
right.Inthetableonpage9,recordthenumberofiron
barsthatsticktoeachironcore.
1
2
Checkthestrengthofanelectromagnet!
⑫Sandpaper⑬Ironcore○Theassembledelectromagnet
Whatyouneed
fromthekit:
Experiment
8
Check the strength of an electromagnet