🧲⚡ Force on a Current-Carrying Wire in a Magnetic Field

Apabila arus elektrik mengalir melalui dawai yang berada dalam medan magnet, satu daya akan bertindak ke atas dawai tersebut dan menyebabkan dawai bergerak.

When an electric current flows through a wire placed in a magnetic field, a force acts on the wire, causing it to move.

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👀 Key Observations | Pemerhatian Penting

✅ Dawai diletakkan di antara kutub Utara (N) dan Selatan (S) magnet.

✅ The wire is placed between the North (N) and South (S) poles of a magnet.

✅ Apabila suis ditutup dan arus mengalir, dawai akan bergerak.

✅ When the switch is closed and current flows, the wire moves.

✅ Semakin besar arus, semakin besar daya yang bertindak ke atas dawai.

✅ The greater the current, the greater the force acting on the wire.

✅ Pergerakan berlaku kerana interaksi antara medan magnet dan medan magnet yang dihasilkan oleh arus.

✅ The movement occurs due to the interaction between the magnetic field and the magnetic field produced by the current.

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❌ Common Mistakes

❌ Menganggap dawai bergerak kerana tarikan magnet sahaja.

❌ Assuming the wire moves because of magnetic attraction alone.

❌ Tidak menyedari bahawa arus mesti mengalir untuk menghasilkan daya.

❌ Failing to realise that current must flow for the force to be produced.

❌ Mengelirukan arah daya dengan arah arus.

❌ Confusing the direction of force with the direction of current.

❌ Menyambung bekalan kuasa secara terbalik tanpa memerhati perubahan arah pergerakan.

❌ Reversing the power supply connections without observing the change in motion.

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⚠️ Safety / Handling

⚠️ Matikan bekalan kuasa apabila mengubah sambungan litar.

⚠️ Switch off the power supply when changing circuit connections.

⚠️ Elakkan arus yang terlalu besar kerana dawai boleh menjadi panas.

⚠️ Avoid excessive current as the wire may become hot.

⚠️ Pastikan magnet diletakkan dengan stabil sepanjang eksperimen.

⚠️ Ensure the magnet is positioned securely throughout the experiment.

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🎯 SPM Exam Tip

📌 Daya magnet hanya terhasil apabila:

📌 Magnetic force is produced only when:

✅ Medan magnet hadir.

✅ A magnetic field is present.

✅ Arus mengalir dalam dawai.

✅ Current flows through the wire.

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📌 Jika arah arus diterbalikkan, arah pergerakan dawai turut berubah.

📌 If the current direction is reversed, the direction of wire motion also reverses.

📌 Jika kutub magnet diterbalikkan, arah daya juga berubah.

📌 If the magnetic poles are reversed, the force direction also reverses.

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🖐️ Fleming's Left-Hand Rule

📌 Digunakan untuk menentukan arah daya ke atas dawai.

📌 Used to determine the direction of force on the wire.

• Thumb = Force (Motion)

• First Finger = Magnetic Field

• Second Finger = Current

• Ibu jari = Daya (Pergerakan)

• Jari Telunjuk = Medan Magnet

• Jari Hantu = Arus