three ways of magnetizing : - Sweeping
- Using a direct current
- Magnetic induction
Magnet material : 1. Non magnetic - Paramagnetic matrials, example : platinum and aluminum
- Diamagnetic materials, examples : bismuth, zinc and sodium
chloride
2. Ferromagnetik materials, examples : irons, steel, nickel, and cobalt
Magnet comprises : - North pole ------------ interaction --------------- Attractive
- South pole ------------ between poles -------------- Repulsive
Three ways of demagnetizing :
- Heating
- Flowing an alternating current
- Hammering
- Number of loops
- Electric current
- Type of core material
Electromagnet used in :- Doobells
- Electromagnetic relays
- Telephones
Bu, Teman anda Mr. Ramdan telah berkencan selingkuh dengan Mrs. Penni guru BP. SD ,
BalasHapusPadahal mereka seudah berkeluarga semua kan ?
saya lihat tadi siang di TP. PADAHAL yppi kan hari ini ulang tahun... mungkin mereka memberi kenangan indah untuk ulang tahunnya YPPI ya bu...
OOOHHHH..... English....!
BalasHapusi never thought yppi would use english for a note! Incredible! >.<
halo bu... ini jessi... masih ingat????
yg pergi k U.S..... :)
Ibu masih kelihatan baik2 disana....
BalasHapusBu Kin lagi teach anak2 kelas berapa???
Bu Kin buat facebook donk.... :)
sudah 3 tahun g bicara.... :)
miss bu kin soo much >.<