Copy of Bab 5. EMF (Kelas hybrid)

In this segment, the instructor introduces concepts related to magnetic flux involving two wires, explaining how the total flux is determined based on the direction of the generated magnetic fields. If the fields are in the same direction, they are added; if they oppose, they are subtracted. The key outcome is understanding magnetic induction and electromotive force (EMF) as initially discovered by Faraday. The session emphasizes the generation of electricity from magnetism and discusses the practical application of these theoretical principles.

The instructor demonstrates a simulation from an online source explaining how electricity is generated using magnetism. A voltmeter, galvanometer, and telephone are connected to a solenoid, and the simulation shows the changes in electricity as a magnet is moved in and out of a coil. This movement alters the magnetic flux through the coil, causing a change in electricity. The key takeaway is understanding how motion of a magnet through a coil influences the electrical output due to changes in magnetic flux.

Emphasis is placed on understanding the relationship between magnetic flux and electricity generation through Faraday's law. As a magnet is moved in a system, the number of magnetic field lines (flux) that pass through a coil varies, thereby altering the generated electricity. The lesson explores the mathematical principles behind this phenomenon, leveraging simulations to visualize how directional changes in a magnetic field can impact electrical outputs. The focus is on grasping the physics underlying electromagnetic induction.

The session discusses Lenz's Law, which helps determine the direction of the induced current during magnetic flux changes. The instructor uses examples of different configurations to demonstrate that the electricity generated depends on the coil's winding and their arrangement relative to the moving magnet. The coil with more windings produces greater electricity when the magnet moves with the same speed. This links back to the principle that flux change rate affects EMF magnitude, highlighting Lenz’s rule in predicting EMF direction.

The instructor continues with examples of how configuring coils and magnets affects electricity generation. This includes examining setups with static conductors and moving magnets, translating these physical movements into mathematical models. Emphasis is on Faraday's and Lenz's laws to understand real-world applications and the inherent challenges in converting magnetic motion into electric power. The focus is on the rate of change of flux and its implications on the generation of electricity, reinforcing fundamental electromagnetic rules.

The session discusses how uniform magnetic fields and conductor movements influence magnetic flux and thus electricity generation. There's a focus on understanding how changes in field strength and area - or their combination - result in different electrical outputs. Further, the concept of uniform magnetic fields and dynamic coil movements in practical setups are explored, stressing how these changes translate into electrical signals according to the interrelated laws of electromagnetism.

Emphasis is on applying theoretical principles to real-world examples, particularly how changing physical properties (like coil dimensions and field direction) allow for control over induced electricity. The segment leverages theoretical equations in practical lab setups. Understanding the uniformity and constancy of the magnetic field's direction and magnitude when applied in consistent coil movements is essential in predicting the outcomes of electrical induction scenarios.

The session involves more in-depth exploration of topics like the interaction between linear motion of conductive materials and static magnetic fields. Principles such as the Lorentz force are discussed, describing how a change in the area penetrated by magnetic lines due to conductor movement alters the induced EMF. The focus is on integrating these laws into practical methodologies, allowing for predictive calculations in controlled environments.

The instructor elaborates on more complex examples involving rotational motion of conductors in magnetic fields. The translation of linear theoretical equations into rotational forms is emphasized, outlining how angular velocity and radius influence induced EMF. The session involves derivations showing the continuity of theoretical principles from linear to rotational dynamics, providing students with a comprehensive understanding of electromagnetic induction principles.

Further examples involve practical approaches to solve real-world problems using electromagnetic principles. The session discusses questions that involve both linear and rotational movements, focusing on coil interactions with magnetic fields. The instructor emphasizes completing detailed calculations for homework problems, highlighting the transformation of theoretical concepts into practical solutions.

The instructor provides guidance on completing assignments using derived formulas related to coil interactions and magnetic field changes. Problems involve various configurations, like solenoids experiencing varying current flows and the subsequent impact on surrounded coils. The focus is on equipping students to handle typical electromagnetic problems, using the relationship between changing magnetic fields and induced voltages efficiently.