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Questions and Answers
A long, straight wire carries a current of 10 A. At what distance from the wire is the magnetic field strength 0.01 T?
A long, straight wire carries a current of 10 A. At what distance from the wire is the magnetic field strength 0.01 T?
- 0.8 m
- 0.4 m
- 0.04 m
- 0.2 m (correct)
A resistor, a capacitor, and an inductor are connected in series to a voltage source. Which of the following is true at resonance?
A resistor, a capacitor, and an inductor are connected in series to a voltage source. Which of the following is true at resonance?
- The impedance is at a minimum (correct)
- The impedance is at a maximum
- The current is at a minimum
- The current is at a maximum
A solenoid has 500 turns, a length of 0.5 m, and a radius of 0.05 m. What is the magnetic field strength at the center of the solenoid if the current is 5 A?
A solenoid has 500 turns, a length of 0.5 m, and a radius of 0.05 m. What is the magnetic field strength at the center of the solenoid if the current is 5 A?
- 1 T
- 1.25 T
- 0.5 T
- 2 T (correct)
A resistor has a resistance of 10 ohms at 20°C and 20 ohms at 100°C. What is the temperature coefficient of resistance of the resistor?
A resistor has a resistance of 10 ohms at 20°C and 20 ohms at 100°C. What is the temperature coefficient of resistance of the resistor?
A Faraday's cup electrometer has a capacitance of 100 pF. What is the potential difference across the electrometer when a charge of 100 μC is deposited on it?
A Faraday's cup electrometer has a capacitance of 100 pF. What is the potential difference across the electrometer when a charge of 100 μC is deposited on it?
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Study Notes
Physics 2 Final Exam Overview
- The exam consists of four sections: Multiple Choice Questions (Concept), Multiple Choice Questions (Calculation), Written Calculations, and Bonus Questions.
Exam Structure
- Multiple Choice Questions (Concept): 4 marks, 4 questions, focusing on conceptual understanding
- Multiple Choice Questions (Calculation): 16 marks, 8 questions, requiring calculations and problem-solving skills
- Written Calculations: 10 marks, 4 questions, assessing in-depth calculation skills
- Bonus Questions: 5 marks, 5 questions, covering basic concepts and formulas
Topics Covered
Current and Resistance
- Electric current: flow of charged particles, SI unit ampere (A)
- Resistance: opposition to current flow, SI unit ohm (Ω)
- Factors affecting resistance: material, length, cross-sectional area, temperature
EMF and Direct Current Circuits
- Electromotive Force (EMF): potential difference between two points, SI unit volt (V)
- Direct Current (DC) circuits: series and parallel connections, Kirchhoff's laws
- Circuit analysis: current, voltage, and resistance relationships
Magnetic Fields and Forces
- Magnetic fields: created by electric currents, described by Biot-Savart law and Lorentz force equation
- Magnetic field strength: measured in tesla (T), magnetic field lines and flux
- Forces on moving charges: Lorentz force, magnetic braking, and Fleming's left-hand rule
Sources of Magnetic Fields
- Current loops: magnetic field strength and direction
- Solenoids: magnetic field strength, direction, and applications
- Toroids: magnetic field strength and direction
Faraday's Law of Induction
- Electromagnetic induction: changing magnetic flux induces EMF
- Faraday's law: mathematical description of electromagnetic induction
- Lenz's law: direction of induced EMF and current
Light and Optics
- Properties of light: wave and particle nature, speed, and electromagnetic spectrum
- Reflection and refraction: laws of reflection, total internal reflection, and Snell's law
- Lenses and optical instruments: image formation, magnification, and applications
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