Grade 10 Physics · Strand 3: Electricity and Magnetism · Electrostatics
Electric Charges and Forces
A short Grade 10 Physics lesson for the CBE curriculum, part of Electricity and Magnetism: Electrostatics. Learn it on any phone with notes and slides, then check yourself with a quick quiz and earn XP. This lesson is free.
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5 questions from this lesson’s quiz. Start the lesson to answer them and see the right answers.
1. A cellulose acetate rod becomes positively charged after being rubbed with wool. What happened during rubbing?
- A. The rod lost electrons to the wool
- B. The rod gained protons from the wool
- C. The rod lost protons to the wool
- D. The rod gained electrons from the wool
2. A negatively charged rod is brought near a suspended sphere and the sphere is attracted to the rod. What can be concluded for certain?
- A. The sphere is definitely negatively charged
- B. The sphere is either positively charged or neutral
- C. The sphere is definitely positively charged
- D. The sphere is definitely neutral
3. A cellulose acetate rod acquires a charge of +4.8 nC after being rubbed with wool. How many electrons were transferred from the rod? Take e = 1.6 x 10^{-19} C and give your answer as a number in units of 10^10 electrons (for example, 5 means 5 x 10^10).
Type your answer (in x 10^10 electrons) in the lesson.
4. Two small charged spheres repel each other with a force F. The distance between them is doubled while the charges stay the same. What is the new force?
- A. F/2
- B. F/4
- C. 2F
- D. 4F
5. What is the name of the SI unit used to measure electric charge?
Type your answer in the lesson.
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