Charging by Conduction
Transferring electrons through direct contact with a negatively charged object
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Conduction
Where did the charge go?
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Me The Physics
Conduction - 2. Conduction
- Charging by Contact
Conduction with a Negative Rod
St. Mary's H.S.
Frame 1 - Neutral Electroscope
Frame 2 - Contact
Frame 3 - Charge Acquired
Electroscope Charge?
Negative (it gains electrons)
Review
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Check Your Understanding
5 quick questions — pick an answer to see if you’re right.
1. What is charging by conduction?
2. A negatively charged rod touches the knob of a neutral electroscope. What charge does the electroscope get?
3. During charging by conduction, which particles move between the objects?
4. After a negative rod touches a neutral electroscope and is removed, the leaves stay apart. Why?
5. By conduction, what charge does an object receive compared with the charged rod that touches it?
Sharing Charge Between Metal Spheres
Three identical metal spheres are mounted on insulating stands. Sphere A has a charge of −8.0 nC, sphere B is neutral, and sphere C has +2.0 nC. (1 nC = 1 × 10−9 C)
Sphere A touches sphere B and they are separated. What is the charge on each?
▶ Want a challenge? Open 6 more Regents-style questions (harder · mixed formats)
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C1. Next, sphere B (now −4.0 nC) touches sphere C (+2.0 nC). What is the charge on each afterward?
C2. When sphere A touched sphere B, sphere A’s charge changed from −8.0 nC to −4.0 nC. Substitute numerical values into a mathematical representation that can be used to determine the number of electrons that moved from A to B. Then calculate the number of electrons.
C3. A student makes the following claim.
Place a check mark in either the Support or Refute box. Justify your response using a mathematical relationship.
C4. After A touches B and then B touches C, the charges are A: −4.0 nC, B: −1.0 nC, C: −1.0 nC. Finally, sphere A touches sphere C and they are separated. Determine the final charge on sphere C. Include the sign.
C5. Why are the spheres mounted on insulating stands?
C6. A student needs to put a charge of exactly −2.0 nC on a sphere. She has sphere A (−8.0 nC) and several identical neutral spheres on insulating stands. Describe a procedure that would produce a sphere with −2.0 nC, and explain why it works.