решите физика ELECTRIC CHARGE 

1. When you rub a comb or a pen on a dry cloth, paper is attracted to the comb. Explain why. 

2. Is it possible to produce a single type of charge in a rubbing process? Explain. 

3. Does the mass of a positively charged metallic sphere change if you touch it? How about a negatively charged sphere? 

4. What are the different types of charge? Where is the location of these charges in materials? 

5. What is a neutral object? Explain.

INSULATORS AND CONDUCTORS 

6. Why do we use silk threads to suspend charged rods instead of metallic threads? 

7. You can never charge a plastic rod by contact or by induction. Why? 

10. A positively charged object A is brought near to a neutral sphere B, which is in contact with a grounded neutral sphere. What will the charges on objects A, B and C be if, after cutting the ground connection, the spheres are separated and object A removed.
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COULOMB’S LAW 

13. Two identical spheres, with charges q₁ = 4⋅10⁻⁸ C and q₂ = 2⋅10⁻⁸ C, are separated by a distance of 0.1 m. Find the electrostatic force exerted by one charge on the other. 

14. The electric force between the charges of  q₁ =2.5 µC and q₂ =–4 µC is 3.6⋅10⁻⁴ N. What is the distance between them? (1 µC =10⁻⁶ C) 

15. What is the electric force between two clouds, having charges  q₁ = 20 C and q₂ = 10 C, if the average distance between them is 5 km. 

16. How does electric force change when the distance between two point charges is increased three times?

ELECTRIC FIELD. ELECTRIC FIELD LINES 

17. Find the magnitude of the electric field at a point 10 cm from a point charge of q = –6 µC. 

18. a) The electric field at a point 27 cm from a charged particle is 10⁵ N/C toward the particle. What is the charge on the particle? Find force acting on q = –1 µC at that point. 

b) A point charge of 1 μC experiences an electric force of 0.02 N. What is the magnitude of electric field at that point?

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sofiyamotkova    3   17.01.2021 18:03    5