Kemagnetan dan Aruhan Elektromagnet

Formula manakah yang mewakili daya magnetomotif (Fm)?

• F_m = N · I

• F_m = B/H

• F_m = Φ/A

• F_m = l/(μ · A)

Answer explanation

The correct formula for magnetomotive force (Fm) is F_m = N · I, where N is the number of turns in a coil and I is the current. This relationship shows how the magnetomotive force is generated in a magnetic circuit.

Bagaimana medan magnet dihasilkan?

• Oleh cas elektrik yang tidak bergerak

• Oleh cas elektrik yang bergerak

• Oleh bahan penebat

• Oleh bahan bukan magnet

Answer explanation

A magnetic field is generated by moving electric charges, such as those in an electric current. Stationary charges do not create a magnetic field, while insulating and non-magnetic materials do not contribute to magnetic field generation.

Apakah definisi ketumpatan fluks magnet (B)?

• Jumlah fluks magnet per unit kawasan

• Penentangan terhadap penciptaan fluks magnet

• Gaya yang menggerakkan fluks magnet melalui litar magnet

• Jumlah daya magnetomotif per unit panjang

Answer explanation

Magnetic flux density (B) is defined as the amount of magnetic flux passing through a unit area. This makes the first choice correct, as it directly describes the relationship between magnetic flux and area.

Yang manakah yang paling tepat menggambarkan tingkah laku garis fluks magnet?

• Ia saling bertemu antara satu sama lain

• Ia membentuk gelung berterusan

• Ia tidak bergerak

• Ia mengikuti laluan yang paling banyak rintangan

Answer explanation

Magnetic flux lines represent the direction and strength of a magnetic field. They form continuous loops, exiting from the north pole and entering the south pole, without intersecting or being stationary.

Bandingkan rintangan elektrik (R) dengan kerintangan magnet (S). Apakah hubungan mereka?

• Kedua-duanya menentang aliran kuantiti masing-masing

• Kedua-duanya meningkatkan aliran kuantiti masing-masing

• Rintangan menentang arus elektrik, manakala kerintangan meningkatkan fluks magnet

• Rintangan meningkatkan arus elektrik, manakala kerintangan menentang fluks magnet

Answer explanation

Both electrical resistance and magnetic reluctance serve to oppose the flow of their respective quantities: resistance opposes electric current, while reluctance opposes magnetic flux.

Bagaimana medan magnet dihasilkan dalam elektromagnet?

• Dengan cas elektrik yang pegun

• Dengan cas elektrik yang bergerak melalui gegelung wayar

• Dengan bahan penebat

• Dengan bahan bukan magnet

Answer explanation

A magnetic field in an electromagnet is generated by moving electric charges through a coil of wire. This movement creates a magnetic field around the wire, which is the principle behind electromagnets.

Apakah formula untuk rintangan (S) dalam litar magnet?

• S = l/(μ · A)

• S = N · I

• S = Φ/A

• S = B/H

Answer explanation

The formula for reluctance (S) in a magnetic circuit is S = l/(μ · A), where l is the length of the magnetic path, μ is the permeability, and A is the cross-sectional area. This choice correctly defines reluctance.

Yang manakah antara pernyataan berikut yang paling tepat menggambarkan tingkah laku garis fluks magnet?

• Ia membentuk gelung berterusan dan tidak pernah bertindih antara satu sama lain.

• Ia bertindih antara satu sama lain dan membentuk laluan yang tidak berterusan.

• Ia tidak bergerak dan tidak berpindah.

• Ia mengikuti laluan dengan rintangan paling tinggi.

Answer explanation

Magnetic flux lines represent the magnetic field and always form continuous loops, indicating the direction of the field. They never intersect because that would imply two different field strengths at the same point, which is impossible.

Bandingkan kuantiti elektrik dengan kuantiti magnet. Pasangan manakah yang sepadan dengan fungsi mereka?

• Voltan (V) dan Fluks Magnet (Φ)

• Arus (I) dan Reluktans (S)

• Rintangan (R) dan Daya Magnetomotif (Fm)

• Voltan (V) dan Daya Magnetomotif (Fm)

Answer explanation

Voltage (V) is analogous to Magnetomotive Force (Fm) as both represent the driving force in their respective fields: electrical and magnetic. Voltage drives current, while Magnetomotive Force drives magnetic flux.

Apa yang dinyatakan oleh Peraturan Tangan Kanan tentang arah medan magnet di sekitar konduktor yang membawa arus?

• Jari telunjuk kiri anda menunjuk ke arah arus, dan jari anda akan melengkung ke arah medan magnet.

• Jari telunjuk kanan anda menunjuk ke arah arus, dan jari anda akan melengkung ke arah medan magnet.

• Jari telunjuk kanan anda menunjuk ke arah medan magnet, dan jari anda akan melengkung ke arah arus.

• Jari telunjuk kiri anda menunjuk ke arah medan magnet, dan jari anda akan melengkung ke arah arus.

Answer explanation

The Right-Hand Rule states that if you point your right thumb in the direction of the current, your fingers will curl in the direction of the magnetic field. This makes the second answer choice correct.