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MODUL • Fizik TINGKATAN 5

3 Faktor-faktor yang mempengaruhi kekuatan medan magnet suatu elektromagnet.
Factors affecting the strength of the magnetic field of an electromagnet.
Faktor Penerangan
Factor Explanation
(a) Arus elektrik Apabila arus bertambah , kekuatan medan magnet bertambah.
Electric current When the current increases , the strength of the magnetic field increases.

(b) Bilangan lilitan wayar Apabila bilangan lilitan wayar bertambah , maka kekuatan medan magnet bertambah.
Number of turns of wire When the number of turns of wire increases , the strength of the magnetic field increases.

(c) Jenis teras Teras yang berbeza mempunyai kekuatan medan magnet yang berbeza. Teras besi lembut
Type of material of core paling kuat
mempunyai medan magnet yang . Teras besi lembut boleh menumpukan
garisan medan magnet yang melaluinya.
Different materials of the core have different strengths of magnetic field. Soft iron core has the
strongest magnetic field. A soft iron core is able to concentrate magnetic field lines
through it.

(d) Bentuk teras besi Teras besi berbentuk U mempunyai medan magnet yang lebih kuat daripada
The shape of the iron core teras besi yang lurus kerana teras besi berbentuk-U mempunyai dua kutub yang bertentangan
bersebelahan antara satu sama lain dan hasilnya garis medan magnet tertumpu dalam ruang di
antara dua kutub.
A U-shaped iron core has a stronger magnetic field than the straight iron core because
U-shaped iron core has two opposite poles adjacent to each other and as a result the magnetic field
lines are concentrated in space between the poles. UNIT 3

UNIT 3

Menentukan kutub hujung solenoid
Determining the poles of a solenoid
Lihat arah arus dari setiap hujung solenoid.
Jika arah arus mengikut arah jam, hujung solenoid itu ialah kutub selatan.
Jika arah arus mengikut arah lawan jam, hujungnya ialah kutub utara.
Look at the direction of the current from each end of the solenoid.
If the direction of the current is clockwise, the viewed end of the solenoid is the south pole.
If the direction of the current is anticlockwise, the viewed end is the north pole.

Arah ikut jam Arah lawan jam
Clockwise Anticlockwise

Kutub selatan Kutub utara
South pole North pole

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03-Physic F5 2018.indd 80 26/08/2019 11:23 AM