Quiz Listrik (Paket: 02) Kelas 9 K13

1.

Perhatikan pernyataan berikut.

listrik yang tidak sejenis tarik-menarik
muatan listrik yang sejenis saling menolak
benda bermuatan positif bila jumlah elektron lebih banyak daripada jumlah proton
muatan benda bermuatan negatif jika jumlah proton lebih banyak daripada jumlah electron

Sifat-sifat dari muatan listrik yang benar sesuai pernyataan nomor ….

1 dan 2

1 dan 3

2 dan 3

2 dan 4

The correct answer is 1 dan 2 because statement 1 states that unlike charges attract each other, which is true. Statement 2 states that like charges repel each other, which is also true. Therefore, both statements 1 and 2 accurately describe the properties of electric charges.

Explanation

The correct answer is 1 dan 2 because statement 1 states that unlike charges attract each other, which is true. Statement 2 states that like charges repel each other, which is also true. Therefore, both statements 1 and 2 accurately describe the properties of electric charges.

2. Gambar berikut menunjukkan baterai dan lampu yang dihubungkan dengan kawat pada beberapa bahan.

1

1 dan 2

1 dan 3

1, 3, 4

The given image shows a battery and a lamp connected by wires to different materials. The correct answer is "1 dan 3." This means that the lamp will light up when it is connected to materials 1 and 3. The explanation for this answer is not available.

Explanation

The given image shows a battery and a lamp connected by wires to different materials. The correct answer is "1 dan 3." This means that the lamp will light up when it is connected to materials 1 and 3. The explanation for this answer is not available.

3. Berikut ini yang bukan gejala listrik statis yang terjadi dalam kehidupan sehari-hari adalah ….

balon menempel di dinding setelah digosokkan ke rambut

kedua telapak tangan terasa panas setelah saling digosokkan

bulu badan tertarik oleh pakaian yang baru saja diseterika

ujung sisir mampu menarik serpihan kertas setelah digunakan untuk bersisir

The correct answer is "kedua telapak tangan terasa panas setelah saling digosokkan". This is because feeling heat in the palms after rubbing them together is not a symptom of static electricity. The other options, such as a balloon sticking to the wall after being rubbed on hair, body hair being attracted to freshly ironed clothes, and a comb being able to attract paper shavings after being used to comb hair, are all examples of static electricity in everyday life.

Explanation

The correct answer is "kedua telapak tangan terasa panas setelah saling digosokkan". This is because feeling heat in the palms after rubbing them together is not a symptom of static electricity. The other options, such as a balloon sticking to the wall after being rubbed on hair, body hair being attracted to freshly ironed clothes, and a comb being able to attract paper shavings after being used to comb hair, are all examples of static electricity in everyday life.

4. Besarnya gaya tarik-menarik atau tolak-menolak antara dua benda yang bermuatan listrik sebanding dengan hasil kali kedua muatan tersebut dan berbanding terbalik dengan kuadrat jarak antara kedua muatan tersebut. Misalkan muatan pertama dilambangkan dengan Q₁, muatan kedua dilambangkan dengan Q₂, dan jarak antara kedua muatan tersebut dilambangkan r. Besarnya gaya coulomb dapat dituliskan dalam persamaan sebagai berikut. Berdasarkan hukum coulomb di atas pernyataan yang sesuai adalah….

The explanation for the given correct answer is that according to Coulomb's law, the force between two charged objects is directly proportional to the product of their charges and inversely proportional to the square of the distance between them. Therefore, if the magnitude of the charges on both objects increases and the distance between them decreases, the force of attraction or repulsion between them will increase.

Explanation

The explanation for the given correct answer is that according to Coulomb's law, the force between two charged objects is directly proportional to the product of their charges and inversely proportional to the square of the distance between them. Therefore, if the magnitude of the charges on both objects increases and the distance between them decreases, the force of attraction or repulsion between them will increase.

5. Sebatang plastik digosok dengan sehelai kain lap. Batang politen menjadi bermuatan negatif dan kain lap menjadi bermuatan positif. Apa yang terjadi dengan batang politen dan kain lap hingga menyebabkan ini terjadi?

(Batang Plastik) ..................................... ( Kain Lap)

memperoleh elektron ............................ memperoleh proton

kehilangan proeton ................................ memperoleh proton

memperoleh elektron ............................. kehilangan elektron

kehilangan proton ................................... kehilangan elektron

When the plastic rod is rubbed with the cloth, the friction between them causes the transfer of electrons from the cloth to the rod. This results in the rod gaining excess electrons and becoming negatively charged (memperoleh elektron). On the other hand, the cloth loses these electrons and becomes positively charged (kehilangan elektron). This charge transfer occurs due to the difference in the electron affinity between the materials, causing one to have a higher affinity for electrons than the other.

Explanation

When the plastic rod is rubbed with the cloth, the friction between them causes the transfer of electrons from the cloth to the rod. This results in the rod gaining excess electrons and becoming negatively charged (memperoleh elektron). On the other hand, the cloth loses these electrons and becomes positively charged (kehilangan elektron). This charge transfer occurs due to the difference in the electron affinity between the materials, causing one to have a higher affinity for electrons than the other.

6. Seseorang sedang membuat sebuah tangki yang besar sekali untuk kepentingan pertanian. Tangki dibuat dari besi dengan bagian atas tangki masih terbuka. Orang itu memakai sepatu dan sedang mengecat dinding tangki. Jika tiba-tiba petir menyambar tangki itu, yang paling mungkin terjadi adalah ….

orang itu tidak tersambar petir karena memakai sepatu

orang itu ikut tersambar petir karena tegangan listrik petir sangat tinggi

orang itu tidak tersambar petir karena muatan listrik petir hanya berada di bagian luar tangki

orang itu ikut tersambar petir karena besi yang diinjaknya tersambar petir

The person is not likely to be struck by lightning because they are wearing shoes. Shoes act as insulators and can help protect against electrical shocks.

Explanation

The person is not likely to be struck by lightning because they are wearing shoes. Shoes act as insulators and can help protect against electrical shocks.

7.

Seorang tukang bangunan memasang alat penangkal petir di atas atap agar dapat mengalirkan muatan arus listrik. Tukang tersebut menghubungkan ujung penangkal petir tersebut dengan tanah menggunakan kabel konduktor. Perbuatan tukang tersebut bertujuan untuk ….

mengambil elektron dari bumi

mengalirkan proton ke bumi

mengalirkan elektron ke bumi

menetralkan bumi

The tukang bangunan is installing a lightning rod on the roof in order to provide a path for the flow of electric current. By connecting the lightning rod to the ground using a conductor, the excess electrons in the atmosphere can be safely discharged to the ground, preventing damage from lightning strikes. Therefore, the purpose of the tukang's action is to "mengalirkan elektron ke bumi" or "direct the flow of electrons to the ground."

Explanation

The tukang bangunan is installing a lightning rod on the roof in order to provide a path for the flow of electric current. By connecting the lightning rod to the ground using a conductor, the excess electrons in the atmosphere can be safely discharged to the ground, preventing damage from lightning strikes. Therefore, the purpose of the tukang's action is to "mengalirkan elektron ke bumi" or "direct the flow of electrons to the ground."

8. Hubungan antara gaya tolak-menolak atau gaya tarik-menarik dua benda bermuatan listrik terhadap jarak keduanya yaitu Dua buah bola masing-masing diberi muatan5 x 10^-9C dan 10 x 10^-4C, jika salah satu benda tersebut dipindahkan sejauh 3 cm dari benda yang lain, maka gaya coulomb yang dapat ditimbulkan kedua benda tersebut adalah….

50 x 10-4

50 x 10-8

30 Newton

50 Newton

The Coulomb's law states that the force between two charged objects is directly proportional to the product of their charges and inversely proportional to the square of the distance between them. In this case, one object has a charge of 5 x 10-9C and the other has a charge of 10 x 10-4C. When the distance between them is 3 cm, the force between them can be calculated using Coulomb's law. The correct answer of 50 Newton indicates that the force between the two objects is 50 Newton.

Explanation

The Coulomb's law states that the force between two charged objects is directly proportional to the product of their charges and inversely proportional to the square of the distance between them. In this case, one object has a charge of 5 x 10-9C and the other has a charge of 10 x 10-4C. When the distance between them is 3 cm, the force between them can be calculated using Coulomb's law. The correct answer of 50 Newton indicates that the force between the two objects is 50 Newton.

9. Perhatikan ilustrasi sebuah elektroskop berikut iniKepala elektroskop bermuatan positif dan kedua daun elektroskop bermuatan negatif, sehingga daun dalam posisi sedikit terbuka. Jika sebuah benda yang bermuatan positif kemudian didekatkan ke kepala elektroskop maka daun elektrokop akan ….

menguncup, karena daun kiri menjadi positif kanan negatif

membuka lebih lebar, karena kedua daun bertambah negatif

membuka lebih lebar, karena kedua daun menjadi lebih positif

menguncup, karena muatan negatif kedua daun berkurang

When a positively charged object is brought near the head of the electroscope, the negative charges on the leaves of the electroscope are attracted to the positive charges on the object. This causes some of the negative charges on the leaves to move towards the positively charged object, reducing the negative charge on the leaves. As a result, the leaves experience a decrease in negative charge and move closer together, causing them to close or "menguncup".

Explanation

When a positively charged object is brought near the head of the electroscope, the negative charges on the leaves of the electroscope are attracted to the positive charges on the object. This causes some of the negative charges on the leaves to move towards the positively charged object, reducing the negative charge on the leaves. As a result, the leaves experience a decrease in negative charge and move closer together, causing them to close or "menguncup".

10. untuk mengetahui besarnya kuat medan listrik dari sebuah muatan, kita hanya memerlukan besarnya muatan tersebut serta jarak muatan uji dari muatan yang akan dicari besar medan listriknya. Terlihat bahwa semakin besar muatannya, semakin besar kuat medan listriknya untuk jarak yang sama. Semakin dekat muatan uji dari suatu muatan yang akan dicari kuat medannya, semakin besar kuat medan listriknya untuk muatan yang sama. Oleh karena itu kuat medan listrik dari sebuah muatan Q yang muatannya 7 m 10^-9C pada jarak 7 cm dari muatan tersebut adalah….

1,29 x 104 N/C

12,9 x 104 N/C

129 x 104 N/C

49 x 10-9 N/C

The given explanation states that to determine the magnitude of the electric field strength of a charge, we only need to know the magnitude of the charge and the distance between the test charge and the charge whose electric field strength is being sought. It is observed that the larger the charge, the larger the electric field strength for the same distance. Similarly, the closer the test charge is to the charge whose electric field strength is being sought, the larger the electric field strength for the same charge. Therefore, the electric field strength of a charge Q with a magnitude of 7 × 10-9C at a distance of 7 cm from the charge is 1.29 x 104 N/C.

Explanation

The given explanation states that to determine the magnitude of the electric field strength of a charge, we only need to know the magnitude of the charge and the distance between the test charge and the charge whose electric field strength is being sought. It is observed that the larger the charge, the larger the electric field strength for the same distance. Similarly, the closer the test charge is to the charge whose electric field strength is being sought, the larger the electric field strength for the same charge. Therefore, the electric field strength of a charge Q with a magnitude of 7 × 10-9C at a distance of 7 cm from the charge is 1.29 x 104 N/C.