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If the potential energy is minimum at `r = r_o = 0.74A^o`, is the force attractive or repulsive at `r = 0.5A^o; 1.9A^o and
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If the potential energy is minimum at `r = r_o = 0.74A^o`, is the force attractive or repulsive at `r = 0.5A^o; 1.9A^o and α`?
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