This appears to be a transcript of a physics lesson or tutorial where various topics related to physics were discussed and solved. The topics covered include:
1. Magnetic fields and right-hand rules.
2. Current sensitivity of a moving coil galvanometer.
3. Calculating the resistance of a galvanometer.
4. Frequency calculation in harmonic motion.
5. Calculating the potential difference across capacitors.
6. Electric potential and capacitance.
7. Charges and potentials in capacitors.
8. Magnetic forces between wires carrying current.
9. Energy stored in capacitors.
10. Calculations involving water and protons.
If you have specific questions or need further explanations on any of these topics, please feel free to ask.
Here are the key facts extracted from the text:
1. Good evening students.
2. Question number one.
3. Sound quality is clear.
4. The question is about the magnetic field at Point O.
5. Magnetic fields are discussed.
6. Circular motion and right-hand rules are mentioned.
7. The correct answer is option D.
8. The next question is about current sensitivity.
9. Moving coil galvanometer has 5 divisions per milliampere.
10. Voltage sensitivity is 20 divisions per volt.
11. Resistance of the galvanometer is discussed.
12. Voltage sensitivity is 20 divisions.
13. One milliampere current is equivalent to 1/4 volt.
14. The answer is option C.
15. The next question is about spherical conductors A and B.
16. They are separated by a distance and uniformly charged.
17. The ratio of electric field magnitudes is to be found.
18. Potential difference is mentioned.
19. Capacitance of capacitors C1 and C2 is discussed.
20. They are initially uncharged.
21. Charge distribution is mentioned.
22. Magnetic forces on wires carrying current are discussed.
23. Like currents repel, unlike currents attract.
24. Resistance is mentioned.
25. Voltage is given to point A.
26. Energy and voltage calculations are mentioned.
27. Total voltage is discussed.
28. There is a question about water and protons.
Please note that these facts are presented in the order they appear in the text.