Mon Prof Augmenté
Charged Spheres on Threads
Age 16 · Physics
Two blue spheres hang apart while a red and a yellow sphere hang close together. The white arrows show the direction and size of the electric force as charge and distance change.
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Age 16: open this week
Browse Age 16
In the picture
- Far-left blue sphere: a sphere carrying the same charge as the other blue sphere.
- Short outward arrow beside the blue sphere: weak repulsion at a wide separation.
- Red sphere: a sphere carrying a charge unlike the yellow sphere.
- Long inward arrow from the red sphere: strong attraction at a close separation.
Examples
- Two inflated balloons rubbed on hair push apart after both pick up the same charge.
- A plastic comb rubbed with wool attracts small paper bits across a short gap.
Key takeaways
- Like charges repel and unlike charges attract.
- The electric force grows stronger as the distance between charges decreases.
Quiz: Charged Spheres on Threads (Age 16)
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What do two electric charges with the same sign do to each other?
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What do two electric charges with opposite signs do to each other?
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As the distance between two electric charges decreases, what happens to the electric force between them?
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