Electromagnetic Induction (Induced Current)
Apabila magnet bergerak relatif terhadap gegelung, arus teraruh dihasilkan dalam gegelung.
When a magnet moves relative to a coil, a current is induced in the coil.
π Key Observations | Pemerhatian Penting
✅ Jarum galvanometer terpesong apabila magnet digerakkan masuk ke dalam gegelung.
✅ The galvanometer needle deflects when the magnet is moved into the coil.
✅ Jarum juga terpesong apabila magnet ditarik keluar dari gegelung.
✅ The needle also deflects when the magnet is pulled out of the coil.
✅ Tiada pesongan apabila magnet dan gegelung berada dalam keadaan pegun.
✅ No deflection occurs when both the magnet and coil remain stationary.
✅ Pesongan berlaku hanya apabila terdapat perubahan fluks magnet.
✅ Deflection occurs only when there is a change in magnetic flux.
π¬ Physics Behind It | Prinsip Fizik
✅ Magnet yang bergerak menghasilkan perubahan medan magnet dalam gegelung.
✅ A moving magnet causes a changing magnetic field through the coil.
✅ Perubahan medan magnet menghasilkan arus teraruh.
✅ The changing magnetic field induces a current.
✅ Semakin cepat magnet digerakkan, semakin besar arus teraruh.
✅ The faster the magnet moves, the greater the induced current.
❌ Common Mistakes
❌ Menganggap magnet perlu menyentuh gegelung untuk menghasilkan arus.
❌ Assuming the magnet must touch the coil to induce a current.
❌ Menganggap magnet pegun boleh menghasilkan arus teraruh.
❌ Assuming a stationary magnet can induce current.
❌ Mengelirukan elektromagnet dengan induksi elektromagnet.
❌ Confusing an electromagnet with electromagnetic induction.
❌ Tidak memerhatikan arah pesongan galvanometer.
❌ Ignoring the direction of galvanometer deflection.
⚠️ Safety / Handling
⚠️ Gerakkan magnet secara perlahan dan terkawal.
⚠️ Move the magnet in a controlled manner.
⚠️ Elakkan menjatuhkan magnet atau galvanometer.
⚠️ Avoid dropping the magnet or galvanometer.
⚠️ Jangan menarik wayar sambungan dengan kuat.
⚠️ Do not pull the connecting wires forcefully.
π― SPM Exam Tip
π Arus teraruh hanya wujud apabila terdapat perubahan fluks magnet.
π Induced current exists only when there is a change in magnetic flux.
π Semakin laju magnet digerakkan:
π The faster the magnet is moved:
✅ Semakin besar pesongan galvanometer.
✅ The greater the galvanometer deflection.
π Menukar arah pergerakan magnet akan menukar arah arus teraruh.
π Reversing the direction of magnet movement reverses the induced current.
π Menukar kutub magnet yang memasuki gegelung juga menukar arah arus.
π Reversing the magnet pole entering the coil also reverses the induced current.
π§ SPM Concept Check
Observation
Jarum galvanometer terpesong apabila magnet digerakkan.
The galvanometer needle deflects when the magnet is moved.
Inference
Arus teraruh dihasilkan dalam gegelung.
An induced current is produced in the coil.
Conclusion
Perubahan medan magnet menghasilkan arus teraruh.
A changing magnetic field induces an electric current.
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