Browsing by Author "Lethole, N.L."
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Item Electricity and Magnetism: PHY 121, Supplementary Examinations November 2024(University of Fort Hare, 2024-11) Lethole, N.L.; Kwinana, P.This supplementary examination paper for PHY 121: Electricity and Magnetism, administered by the University of Fort Hare in November 2024, assesses students' comprehensive understanding of fundamental principles in electromagnetism. The 100-mark paper, spanning four main questions, covers core concepts including Coulomb's law, conservation of charge, electric fields and potential energy of dipoles, properties of conductors, semiconductors, and insulators, and the relationship between electric forces and mechanical weight. Furthermore, it delves into electromotive force, power, resistivity, electron drift velocity in current-carrying wires, electrical measuring instruments, Kirchhoff's rules, and the motion of charged particles in magnetic fields. The paper also requires derivations and applications of the Biot-Savart law for magnetic fields due to current elements and circular coils. A formulae sheet and fundamental physical constants are provided to support problem-solving.Item Electromagnetism: PHY 123, Degree Examinations October/November 2024(University of Fort Hare, 2024-11) Ndevu, L.; Lethole, N.L.Item Electromagnetism: PHY 123, Supplementary Examinations November 2024(University of Fort Hare, 2024-11) Ndevu, L.; Lethole, N.L.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.Item Introduction to Solid State Physics: PHY 512, Honours Examinations June 2023(University of Fort Hare, 2023-06) Lethole, N.L.; Chikwembani, S.Item Mechanics of a Particle: PHY 111, Aegrotat Examinations June 2023(University of Fort Hare, 2023-06) Lethole, N.L.; Xuza, V.A.Item Mechanics of a Particle: PHY 111, Degree Examinations June 2023(University of Fort Hare, 2023-06) Lethole, N.L.; Xuza, V.A.Item Mechanics of a Particle: PHY 111, Degree Examinations May/June 2025(University of Fort Hare, 2025-05) Lethole, N.L.; Kwinana, P.