Rankers Physics

Potential Energy & Equilibrium: Practice Problem & Solution

If potential energy between electron and proton at a distance r is given by U =-(ke²/3r³), then force acting is
F = ke²/r²
F = ke²/r

Short Solution (Best for NEET):

To solve this problem, we apply the core principles of Potential Energy & Equilibrium. Understanding the underlying formula is key to arriving at the correct answer below:

Force F = - dU/dr = d ((ke²/3r³))/dr = ke²/r^4

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