magnet
TRANSCRIPT
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MAGNET Medan Magnet Gaya Magnet
Oleh :ISMAIL, S.Si., M.Si
PHYSICS PRESENTATION SERIESSMA WARGA SURAKARTA
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KLASIFIKASI BAHAN MAGNETDiamagnet
•Timah•Aluminium•Emas
Paramagnet
•Platina•Tembaga
Ferromagnet
•Besi•Baja•Nikel•Kobalt
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SOFT & HARD FERROMAGNETIK
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MEDAN MAGNET PADA KAWAT BERARUS
• Hans Christian Oersted pada 1820 menunjukkan bahwa disekitar kawat berarus listrik terdapat medan magnet
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KAWAT LURUS BERARUSKaidah tangan kanan untuk kawat lurus berarus :
“ Ibu jari arah arus listrik, empat jari melingkar arah medan magnet “
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KUAT MEDAN MAGNET
rIB
2
0B = kuat medan magnet (Tesla)µ0 = 4π.10 - 7 Wb/AmI = arus listrik (Ampere)r = jarak tegak lurus ke kawat
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KAWAT MELIGKAR BERARUSKaidah tangan kanan untuk kawat melingkar berarus:
“ Ibu jari arah medan magnet, empat jari melingkar arah arus listrik“
B
I
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KUAT MEDAN MAGNET
rINB20
B = kuat medan magnet (Tesla)µ0 = 4π.10 - 7 Wb/AmI = arus listrik (Ampere)N = jumlah lilitan kawat lingkarr = jari-jari kawat melingkar
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SOLENOIDA BERARUSKaidah tangan kanan untuk solenoida berarus:
“ Ibu jari arah medan magnet, empat jari melingkar arah arus listrik“
L
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KUAT MEDAN MAGNET
LINB 0
B = kuat medan magnet (Tesla)µ0 = 4π.10 - 7 Wb/AmI = arus listrik (Ampere)N = jumlah lilitan kawatL = panjang solenoida
1) Di tengah-tengah solenoida
LINB20
2) Di ujung solenoida
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TOROIDA BERARUSKaidah tangan kanan untuk toroida berarus:
“ Ibu jari arah medan magnet, empat jari melingkar arah arus listrik“
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KUAT MEDAN MAGNET
rINB
20
B = kuat medan magnet (Tesla)µ0 = 4π.10 - 7 Wb/AmI = arus listrik (Ampere)N = jumlah lilitan toroidar = jari-jari efektif toroida