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Physics

Chapter 1 - Electric Current, Ohms Law and Kirchhoffs Laws

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Chapter 2 - Magnetic Effects of Electric Current and Measuring Instruments

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Chapter 3 - Electromagnetic Induction and AC Dynamo and Transformer

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Chapter 4 - Alternating Current AC Circuits

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Chapter 5 - Dual Nature of Wave and Particle

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Chapter 6 - Atomic Spectra and X-Rays

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Chapter 7 - Lasers and Principles

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Chapter 8 - Modern Electronics and Semiconductors

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Quiz

Lesson 1 Quiz: Magnetic Field of a Straight Wire, Circular Coil and Solenoid

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1.
STEM Alternating Current Dynamo Problem 11: An AC generator coil of 100 turns and area 0.05 m2 rotates at 3,000 rpm in a uniform magnetic field of 0.14 T. What is the maximum electromotive force (EMF_max) generated? (Use π = 22/7)
110 V
440 V
311 V
220 V
2.
STEM Kirchhoff's Laws Problem 13: In a closed circuit junction, currents I1 = 2 A and I2 = 3 A flow toward junction A, while I3 = 1 A flows away. According to Kirchhoff's First Law (KCL), what is the magnitude and direction of the remaining current I
4 A flowing toward junction A
2 A flowing toward junction A
4 A flowing away from junction A
6 A flowing away from junction A
3.
According to the Egyptian Physics syllabus, what is the valid physical deduction for: Einstein's Photoelectric Equation and Work Function?
Photoelectrons are emitted only if the incident photon frequency exceeds the threshold frequency (ν ≥ ν_c), and maximum kinetic energy is KE_max = hν - E_w, independent of light intensity
Photoelectron emission occurs at any frequency if intensity is high enough
Work function E_w is universal and identical for all metals
Increasing light intensity increases the maximum kinetic energy of emitted electrons
4.
STEM Semiconductor Electronics Problem 9: How is a p-type semiconductor crystal produced from pure intrinsic silicon?
By heating pure silicon above 1,000°C without impurities
By doping with pentavalent Phosphorus atoms
By doping the silicon crystal with trivalent impurity atoms (such as Boron or Aluminum), creating positive holes as majority carriers
By cooling silicon to absolute zero Kelvin
5.
STEM Semiconductor Electronics Problem 6: How is a p-type semiconductor crystal produced from pure intrinsic silicon?
By heating pure silicon above 1,000°C without impurities
By doping with pentavalent Phosphorus atoms
By doping the silicon crystal with trivalent impurity atoms (such as Boron or Aluminum), creating positive holes as majority carriers
By cooling silicon to absolute zero Kelvin
6.
STEM Modern Physics Laser Problem 17: What fundamental condition is strictly required to achieve laser amplification via stimulated emission?
Thermal equilibrium where ground state atoms dominate
Complete absence of resonant optical mirrors
High electrical resistance in the discharge tube
Population inversion, where the number of atoms in the metastable excited state exceeds that in the lower energy state
7.
STEM Kirchhoff's Laws Problem 23: In a closed circuit junction, currents I1 = 2 A and I2 = 3 A flow toward junction A, while I3 = 1 A flows away. According to Kirchhoff's First Law (KCL), what is the magnitude and direction of the remaining current I
4 A flowing away from junction A
4 A flowing toward junction A
6 A flowing away from junction A
2 A flowing toward junction A
8.
STEM Kirchhoff's Laws Problem 36: In a closed circuit junction, currents I1 = 2 A and I2 = 3 A flow toward junction A, while I3 = 1 A flows away. According to Kirchhoff's First Law (KCL), what is the magnitude and direction of the remaining current I
4 A flowing toward junction A
4 A flowing away from junction A
2 A flowing toward junction A
6 A flowing away from junction A
9.
STEM AC Transformer Problem 3: An ideal step-down transformer connected to a 220 V mains supply delivers power to a 12 V, 24 W lamp. What is the current flowing in the primary coil?
2.0 A
1.5 A
0.545 A
0.109 A
10.
STEM Alternating Current Dynamo Problem 44: An AC generator coil of 100 turns and area 0.05 m2 rotates at 3,000 rpm in a uniform magnetic field of 0.14 T. What is the maximum electromotive force (EMF_max) generated? (Use π = 22/7)
311 V
110 V
220 V
440 V
11.
STEM Kirchhoff's Laws Problem 39: In a closed circuit junction, currents I1 = 2 A and I2 = 3 A flow toward junction A, while I3 = 1 A flows away. According to Kirchhoff's First Law (KCL), what is the magnitude and direction of the remaining current I
4 A flowing away from junction A
4 A flowing toward junction A
6 A flowing away from junction A
2 A flowing toward junction A
12.
STEM Modern Physics Laser Problem 15: What fundamental condition is strictly required to achieve laser amplification via stimulated emission?
Complete absence of resonant optical mirrors
Thermal equilibrium where ground state atoms dominate
Population inversion, where the number of atoms in the metastable excited state exceeds that in the lower energy state
High electrical resistance in the discharge tube
13.
STEM Kirchhoff's Laws Problem 2: In a closed circuit junction, currents I1 = 2 A and I2 = 3 A flow toward junction A, while I3 = 1 A flows away. According to Kirchhoff's First Law (KCL), what is the magnitude and direction of the remaining current I4
4 A flowing toward junction A
4 A flowing away from junction A
2 A flowing toward junction A
6 A flowing away from junction A
14.
STEM Kirchhoff's Laws Problem 31: In a closed circuit junction, currents I1 = 2 A and I2 = 3 A flow toward junction A, while I3 = 1 A flows away. According to Kirchhoff's First Law (KCL), what is the magnitude and direction of the remaining current I
4 A flowing away from junction A
6 A flowing away from junction A
2 A flowing toward junction A
4 A flowing toward junction A
15.
STEM Kirchhoff's Laws Problem 20: In a closed circuit junction, currents I1 = 2 A and I2 = 3 A flow toward junction A, while I3 = 1 A flows away. According to Kirchhoff's First Law (KCL), what is the magnitude and direction of the remaining current I
2 A flowing toward junction A
4 A flowing away from junction A
4 A flowing toward junction A
6 A flowing away from junction A
16.
STEM Modern Physics Laser Problem 9: What fundamental condition is strictly required to achieve laser amplification via stimulated emission?
Complete absence of resonant optical mirrors
High electrical resistance in the discharge tube
Population inversion, where the number of atoms in the metastable excited state exceeds that in the lower energy state
Thermal equilibrium where ground state atoms dominate
17.
STEM Alternating Current Dynamo Problem 26: An AC generator coil of 100 turns and area 0.05 m2 rotates at 3,000 rpm in a uniform magnetic field of 0.14 T. What is the maximum electromotive force (EMF_max) generated? (Use π = 22/7)
220 V
311 V
440 V
110 V
18.
STEM Alternating Current Dynamo Problem 8: An AC generator coil of 100 turns and area 0.05 m2 rotates at 3,000 rpm in a uniform magnetic field of 0.14 T. What is the maximum electromotive force (EMF_max) generated? (Use π = 22/7)
220 V
311 V
110 V
440 V
19.
STEM AC Transformer Problem 12: An ideal step-down transformer connected to a 220 V mains supply delivers power to a 12 V, 24 W lamp. What is the current flowing in the primary coil?
0.109 A
2.0 A
1.5 A
0.545 A
20.
STEM AC Transformer Problem 22: An ideal step-down transformer connected to a 220 V mains supply delivers power to a 12 V, 24 W lamp. What is the current flowing in the primary coil?
2.0 A
0.545 A
0.109 A
1.5 A
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