Electromagnetism: PHY 123, Supplementary Examinations November 2024
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Date
2024-11
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University of Fort Hare
Abstract
This supplementary examination paper for PHY 123, "Electromagnetism," is a 2-hour assessment worth a total of 100 marks. Students are required to answer all questions, with useful information provided on the last page. The paper comprehensively covers fundamental concepts in electromagnetism, circuits, and electrostatics.
Question 1 consists of multiple-choice questions testing foundational knowledge, including the relationship between force and charge separation, dimensional equivalence of electric fields, significance of electric field lines, Ohm's Law and resistance, temperature effects on resistivity, power dissipated by a resistor, Kirchhoff's first rule, units of capacitance, factors affecting capacitor charge and capacitance, calculating charge on a capacitor, and the effect of voltage on charge, electric field, and stored energy in a parallel plate capacitor. It also includes a question on calculating the combined capacitance of capacitors in series.
Question 2 focuses on circuits. It requires calculations involving a battery's EMF, internal resistance, load resistance to find current, terminal voltage, and various power deliveries. Students must also determine equivalent resistances in different resistor configurations, including a bridge-like circuit. Lastly, it involves calculating current based on the number of electrons passing a point in a wire over time.
Question 3 delves into electric fields and forces. It asks for the magnitude of an electric field based on a proton's momentum change over time, and requires determining the magnitude and direction of the net force on a charge in a multi-charge coordinate system.
Question 4 covers capacitors and power in circuits. It requires an explanation of the capacitor charging process with diagrams, and calculations of power delivered to a light bulb in single, series, and parallel configurations within a circuit.
Finally, Question 5 presents a complex resistor network, asking students to find the equivalent resistances between specified points. The examination aims to evaluate students' theoretical understanding and problem-solving abilities in electromagnetism and circuit analysis.
Description
Electromagnetism: PHY 123, Supplementary Examinations November 2024