Force between two point charges and placed in vacuum at cm apart is . Force between them when placed in a medium having dielectric at cm apart will be:

Question

Force between two point charges  and  placed in vacuum at  cm apart is . Force between them when placed in a medium having dielectric  at  cm apart will be:

Canvas Classes · Accepted Answer

🧠 Two Changes at Once — Dielectric Weakens, Shorter Distance Strengthens

Coulomb's law has two handles here, and the question turns both. Read carefully: the dielectric  divides the force by 5, but the distance also drops from  to . Force goes as , so that shorter distance multiplies the force by . The final answer is the product of the two effects. Do not change only one and forget the other.

🗺️ Working It Out

In vacuum at distance : .

In the medium  at distance :
.

⚡ The Smart Move

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