A physics student is designing a novel electromagnetic generator for a science competition. The generator consists of a rectangular coil with 500 turns, rotating within a uniform magnetic field of 0.8 T. The coil has dimensions of 10 cm by 15 cm and is connected to an external circuit with a resistance of 10 ohms. The student aims to achieve a maximum induced EMF of 12 V.
c. The student observes that the direction of the induced current in the coil changes periodically as it rotates. Explain why the direction of the induced current changes, and relate your explanation to Lenz’s Law.
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Create Free Account Log inThis is a free VCE Units 3 & 4 Physics practice question worth 3 marks, testing your understanding of Generating emf. It falls under How are fields used in electricity generation? in Unit 3: How do fields explain motion and electricity?. Submit your answer above to receive instant AI-powered marking and personalised feedback.
In this unit students use Newton’s laws to investigate motion in one and two dimensions. They explore the concept of the field as a model used by physicists to explain observations of motion of objects not in apparent contact. Students compare and contrast three fundamental fields – gravitational, magnetic and electric – and how they relate to one another. They consider the importance of the field to the motion of particles within the field. Students examine the production of electricity and its delivery to homes. They explore fields in relation to the transmission of electricity over large distances and in the design and operation of particle accelerators. A student-designed practical investigation involving the generation of primary data and including one continuous, independent variable related to fields, motion or light is undertaken either in Unit 3 or Unit 4, or across both Units 3 and 4, and is assessed in Unit 4, Outcome 2. The design, analysis and findings of the investigation are presented in a scientific poster format.
In this area of study, students use empirical evidence and models of electric, magnetic and electromagnetic effects to explain how electricity is produced and delivered to homes. They explore the transformer as critical to the performance of electrical distribution systems in minimising power loss.
Investigate and analyse theoretically and practically the generation of electromotive force (emf) including AC voltage and calculations using induced emf: ε = −NΔΦ/Δt, with reference to: • rate of change of magnetic flux • number of loops through which the flux passes • direction of induced emf in a coil.
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