POTENTIAL at centre is ZERO, then \[{{V}_{1}}+{{V}_{2}}+{{V}_{3}}+{{V}_{4}}=0\] \[-\frac{kQ}{r}-\frac{kq}{r}+\frac{k2Q}{r}+\frac{k2q}{r}=0\] \[-Q-q+2q+2Q=0\] \[Q=-q\]

"> POTENTIAL at centre is ZERO, then \[{{V}_{1}}+{{V}_{2}}+{{V}_{3}}+{{V}_{4}}=0\] \[-\frac{kQ}{r}-\frac{kq}{r}+\frac{k2Q}{r}+\frac{k2q}{r}=0\] \[-Q-q+2q+2Q=0\] \[Q=-q\]

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Four point charges \[-Q,\,-q,\text{ }2q\] and \[2Q\] are placed, one at each comer of the square. The relation between Q and q for which the potential at the centre of the square is zero, is [AIPMT(S) 2012]

NEET Physics in NEET . 8 months ago

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[a] If POTENTIAL at centre is ZERO, then \[{{V}_{1}}+{{V}_{2}}+{{V}_{3}}+{{V}_{4}}=0\] \[-\frac{kQ}{r}-\frac{kq}{r}+\frac{k2Q}{r}+\frac{k2q}{r}=0\] \[-Q-q+2q+2Q=0\] \[Q=-q\]

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