Point charges $ + 4q,\,\, - q\;{\rm{ and }} + 4q$ are kept on the ${\rm{x - axis}}$ at points $x = 0,\,\,x = a{\rm{ \,\,and}}\,\,\,{\rm{ }}x = 2a$ respectively, for displacement along ${\rm{x - axis}}$ :-

only –q is in stable equilibrium

none of the charges are in equilibrium

all the charges are in stable equilibrium

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JEE PHYSICS MCQ: ELECTRIC FIELDS AND CHARGES

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Analyzing +4 | -1

Point charges

+ 4q,\,\, - q\;\mathrm{ and } + 4q

are kept on the

\mathrm{x - axis}

at points

x = 0,\,\,x = a\mathrm{ \,\,and}\,\,\,\mathrm{ }x = 2a

respectively, for displacement along

\mathrm{x - axis}

View answer and explanation

Correct option: C

all the charges are in unstable equilibrium

Option C (all the charges are in unstable equilibrium) is correct because any slight displacement from their positions will cause them to move further away, indicating unstable equilibrium.

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