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5.work,energy,power and collision — Physics STD 11 Science — Question

Gujarat BoardEnglish MediumSTD 11 SciencePhysics5.work,energy,power and collision1 Mark
MCQ
The potential energy $U$ between two molecules as a function of the distance $X$ between them has been shown in the figure. The two molecules are
  • A
    Attracted when $x$ lies between $A$ and $B$ and are repelled when $X$ lies between $B$ and $C$
  • ✓
    Attracted when $x$ lies between $B$ and $C$ and are repelled when $X$ lies between $A$ and $B$
  • C
    Attracted when they reach $B$
  • D
    Repelled when they reach $B$
✓

Answer

Correct option: B.
Attracted when $x$ lies between $B$ and $C$ and are repelled when $X$ lies between $A$ and $B$
b
(b) $F = - \left( {\frac{{dU}}{{dx}}} \right)$. 

In the region $BC$ slope of the graph is positive 

$F =$ negative i.e. force is attractive in nature 

In the region $AB$ slope of the graph is negative 

$ F =$ positive i.e. force is repulsive in nature

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