Conservation of Charge
Electric charge can move between objects, but the total charge remains constant
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Conservation
Conservation of Charge Instruction
showmethephysics.com
Try this at home! Water BendingSchool blocks YouTube? Use the file below. Water is an electrically polar molecule. This means it has a positive and negative pole. The water's negative pole is repelled by the negatively charged comb and the positive pole is attracted to the comb. This reorientation of charge makes the side of the water stream that is near the comb positive. Since opposites attract, the water stream is pulled towards the comb.
School blocks Youtube? Use file below.
Fill in The Blanks Conservation of Charge Notes
D) Conservation of Charge - net charge of closed system remains constant
If 2 charges OR MORE
Charge is Evenly Distributed
d)+14 elem. charges
Conservation of Charge
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Check Your Understanding
5 quick questions — pick an answer to see if you’re right.
1. What does the law of conservation of charge state?
2. Identical metal spheres A (+12 elementary charges) and B (+16 elementary charges) touch. What is A's charge after contact?
3. Identical spheres with charges of +6 and −2 elementary charges touch and separate. What is each sphere's charge?
4. Three identical metal spheres with charges +9, +3, and 0 elementary charges all touch at once. What is the final charge on each?
5. A negatively charged comb bends a thin stream of water toward it. Why?
Charge in Particle Reactions
Charge is conserved in every process, including the decay of subatomic particles. A free neutron (charge 0) decays into a proton, an electron, and an antineutrino (charge 0).
Which statement shows that charge is conserved in this decay?
▶ Want a challenge? Open 6 more Regents-style questions (harder · mixed formats)
Challenge score: 0 / 6
C1. A student makes the following claim about the alpha decay of uranium-238: 23892U → 23490Th + 42He.
Place a check mark in either the Support or Refute box. Justify your response using a mathematical relationship.
C2. A plastic comb gains 3.0 × 1011 electrons when it is pulled through dry hair. Substitute numerical values into a mathematical representation that can be used to determine the magnitude of the charge on the comb. Then calculate the charge.
C3. Three identical metal spheres with charges +5 nC, −3 nC, and +1 nC are touched together and separated. What is the charge on each?
C4. In a particle accelerator, two protons collide and produce the reaction p + p → p + n + X, where X is a new particle. Using conservation of charge (p = +1e, n = 0), determine the charge of particle X in units of e. Include the sign.
C5. Which proposed reaction is impossible because it violates conservation of charge? (p = +1e, n = 0, e− = −1e)
C6. A student has a plastic rod, a wool cloth, and a charge sensor that measures the net charge of anything placed inside a metal cup. Describe an investigation that would provide evidence that charge is conserved when the rod is rubbed with the cloth. Identify the evidence that would support conservation of charge.