Objectives (5 - 7 minutes)

1. Conceptual Understanding of Solenoid: The teacher must ensure that students understand what a solenoid is and what its main characteristics are. This includes understanding that a solenoid is a device that can create a magnetic field when an electric current passes through it.

2. Identification of the properties of the Magnetic Field generated by a Solenoid: Students should learn to identify the properties of the magnetic field generated by a solenoid, such as the direction and sense of the magnetic field. Additionally, they should understand how the intensity of the magnetic field varies at different points around the solenoid.

3. Application of Magnetic Field formulas for a Solenoid: Students should be able to apply the formulas to calculate the magnetic field inside and outside a solenoid. This involves understanding the variables involved in these formulas and how they affect the result.

   • Secondary Objective: Develop problem-solving skills and logical reasoning through the application of these formulas.

Secondary Objectives:

• Application of Physics concepts to real-world situations: The teacher should encourage students to relate the use of solenoids to practical examples, such as in electromagnets, electric motors, electric locks, among others.

• Development of critical thinking: Students should be able to analyze and interpret the properties of the magnetic field generated by a solenoid, applying critical thinking to solve problems and make decisions. For example, they should be able to predict how changes in the solenoid (such as the number of turns or the electric current) can affect the generated magnetic field.

The teacher should present these Objectives at the beginning of the class and review them at the end to ensure they have been achieved. Additionally, students should be encouraged to ask questions and seek clarification during the class to ensure understanding of the Objectives.

Introduction (10 - 15 minutes)

1. Review of basic concepts (3 - 5 minutes): The teacher should start the class by reviewing basic concepts about magnetism and electric current. This includes explaining what a magnetic field is, how it is generated by an electric current, and how the direction and sense of the magnetic field are determined.

2. Problem-solving situations (5 - 7 minutes): Next, the teacher should propose two problem-solving situations involving the use of solenoids. For example, students may be asked how a solenoid is used in an electromagnet to lift metal objects or how a solenoid is used in an electric motor to convert electrical energy into mechanical energy. These situations should be challenging enough to stimulate critical thinking and curiosity among students.

3. Contextualization (2 - 3 minutes): The teacher should then explain the importance of studying solenoids, highlighting that these devices are widely used in everyday technologies, such as household appliances, automobiles, and medical equipment. Additionally, it should be mentioned that understanding the magnetic field generated by a solenoid is fundamental for the study of more complex magnetic phenomena, such as electromagnetism.

4. Engaging students' attention (2 - 3 minutes): Finally, the teacher should share some interesting facts or applications of solenoids. For example, it can be mentioned that solenoids are used in particle accelerators to control the movement of subatomic particles or that they are used in security systems to detect the presence of metals. These curiosities should arouse students' curiosity and motivate them to learn more about the subject.

Development (20 - 25 minutes)

1. Theory (10 - 12 minutes): The teacher should start the theory by explaining what a solenoid is. It should emphasize that a solenoid is a device composed of a conductor wire that is wound around a core, forming a coil. The teacher should draw a solenoid on the board and show the direction of the electric current passing through it.

   1.1 Magnetic Field inside a Solenoid: The teacher should explain that inside a solenoid, the magnetic field is uniform and parallel to the solenoid's axis. The teacher can use a compass to demonstrate this, showing that the compass needle aligns with the solenoid.

   1.2 Magnetic Field outside a Solenoid: Next, the teacher should explain that outside a solenoid, the magnetic field is similar to the magnetic field generated by a bar magnet. The teacher can use a compass again to demonstrate this, showing that the compass needle aligns with the solenoid's magnetic field.

   1.3 Intensity of the Magnetic Field in a Solenoid: The teacher should explain that the intensity of the magnetic field generated by a solenoid depends on the number of turns of the conductor wire, the electric current passing through it, and the properties of the core material. The teacher should show the formula to calculate the intensity of the magnetic field inside a solenoid (B = μ₀ * n * I), explaining the meaning of each variable.

2. Application of Formulas (5 - 7 minutes): The teacher should then show how to apply the formulas to calculate the magnetic field in a solenoid. For this, the teacher should propose some practical examples and guide the students step by step in solving the problems.

   2.1 Example 1 - Magnetic Field inside a Solenoid: The teacher can start with a simple example, calculating the magnetic field inside a solenoid. The teacher should provide the values of the variables in the formula and guide the students to substitute them and calculate the result.

   2.2 Example 2 - Magnetic Field outside a Solenoid: Next, the teacher can propose a slightly more complex example, calculating the magnetic field outside a solenoid. The teacher should guide the students to identify the differences between this example and the previous one and apply the formula correctly.

   2.3 Example 3 - Variation of the Magnetic Field with the Electric Current: Finally, the teacher can propose an example involving the variation of the magnetic field with the electric current. The teacher should guide the students to analyze how the electric current affects the magnetic field and calculate the magnetic field for different values of electric current.

3. Discussion and Clarification of Doubts (3 - 5 minutes): After solving the examples, the teacher should promote a discussion about the results obtained. The teacher should ask students what they observed in the examples and what conclusions can be drawn. The teacher should also clarify any doubts students may have and reinforce the concepts and formulas discussed.

This Development of the class should allow students to acquire a solid understanding of the magnetic field generated by a solenoid and the formulas to calculate its intensity. Additionally, students should develop problem-solving skills and critical thinking through the application of these formulas.

The teacher should actively monitor students' progress during this stage, providing feedback and guidance as needed. Additionally, the teacher should encourage students to ask questions and actively participate in the discussion to ensure that all concepts are understood.

Return (8 - 10 minutes)

1. Content Review (3 - 4 minutes): The teacher should start this stage by reviewing the main contents covered in the class. This includes recapitulating the concept of a solenoid, the characteristics of the magnetic field generated by it, and the formulas to calculate the intensity of the magnetic field. The teacher should ask targeted questions to students to verify content retention and clarify any remaining doubts.

2. Connection between Theory and Practice (2 - 3 minutes): The teacher should then explain how the class connected the theory of solenoids with practice. This may include reviewing practical examples used during the class to illustrate the application of the formulas. The teacher should highlight that understanding the magnetic field generated by a solenoid is fundamental to understanding the operation of many electromagnetic devices used in everyday technologies.

3. Reflection on Learning (2 - 3 minutes): The teacher should propose that students reflect individually on what they learned during the class. To facilitate this reflection, the teacher can ask the following questions:

   3.1 What was the most important concept learned today? The teacher should encourage students to identify the most crucial concept for understanding the magnetic field generated by a solenoid. This may include understanding that the magnetic field inside a solenoid is uniform and parallel to the solenoid's axis, while outside the solenoid it is similar to the magnetic field generated by a bar magnet.

   3.2 What questions have not been answered yet? The teacher should encourage students to reflect on any doubts or questions they may still have on the subject. This may include questions about the application of the formulas, the influence of different variables on the magnetic field, or the relationship between the magnetic field and the solenoid's core.

4. Teacher's Feedback (1 - 2 minutes): Finally, the teacher should provide feedback to students on their performance during the class. The teacher should praise students' efforts, highlight strengths, and identify areas that need more practice or study. This may include suggestions for additional exercises, complementary readings, or online resources for review.

This Return stage is essential to consolidate students' learning and ensure that they have understood the concepts and skills covered in the class. Additionally, it allows the teacher to assess the effectiveness of their instruction and make adjustments as necessary for future classes.

Conclusion (5 - 7 minutes)

1. Review of Contents (2 - 3 minutes): The teacher should recap the main points discussed during the class. This includes the definition of a solenoid, the characteristics of the magnetic field generated by it, the formulas to calculate the intensity of the magnetic field inside and outside the solenoid, and the importance of the number of turns and the electric current in the intensity of the magnetic field. The teacher should reinforce these concepts, emphasizing their practical application.

2. Connection between Theory, Practice, and Applications (1 - 2 minutes): The teacher should emphasize how the class connected theory, practice, and applications. This includes recalling the practical examples used during the class to illustrate the application of the formulas, and how these applications are relevant in the real world. The teacher should highlight that understanding the magnetic field generated by a solenoid is fundamental to understanding the operation of many electromagnetic devices used in everyday technologies.

3. Extra Materials (1 - 2 minutes): The teacher should suggest extra materials for students who wish to deepen their knowledge on the subject. This may include Physics books, educational websites, explanatory videos, interactive simulations, among others. The teacher should emphasize that exploring these materials can be very useful to reinforce the understanding of the concepts and for additional practice.

4. Importance of the Subject (1 minute): Finally, the teacher should highlight the importance of the subject presented for daily life, emphasizing that many technologies we use daily, such as household appliances, automobiles, and medical equipment, depend on the magnetic field generated by solenoids. Additionally, the teacher may mention that the study of solenoids and magnetism in general is fundamental for the development of future technologies and for the understanding of natural phenomena.

The Conclusion is a crucial part of the class, as it helps consolidate learning, motivate students to continue studying the subject, and understand the relevance of what has been learned. The teacher should ensure that all concepts were clearly communicated and that students have a solid understanding of the topic. Additionally, the importance of practice and continuous study should be emphasized to strengthen the understanding of the subject.