Two pith balls carrying equal charges are suspended from a common point by strings of equal length, the equilibrium separation between them is \(r\) (as shown in Fig. I). Now, as shown in Fig. II, the strings are rigidly clamped at half the height. The equilibrium separation between the balls now becomes:
     
1. \(\frac{r}{\sqrt[3]{2}}\)
2. \(\frac{r}{\sqrt[2]{2}}\)
3. \(\frac{2r}{3}\)
4. none of the above

Subtopic:  Coulomb's Law |
 70%
From NCERT
AIPMT - 2013
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NEET 2023 - Target Batch - Aryan Raj Singh
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A charge \(q\) is placed at the center of the line joining two equal charges \(Q.\) The system of the three charges will be in equilibrium if \(q\) is equal to:
1. \(-Q/4\)
2. \(Q/4\)
3. \(-Q/2\)
4. \(Q/2\)
Subtopic:  Coulomb's Law |
 68%
From NCERT
NEET - 2013
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Two positive ions, each carrying a charge q, are separated by a distance d. If F is the force of repulsion between the ions, the number of electrons missing from each ion will be:
(e is the charge on an electron)

1. 4πε0Fd2e2

2. 4πε0Fd2d2

3. 4πε0Fd2e2

4. 4πε0Fd2q2

Subtopic:  Coulomb's Law |
 77%
From NCERT
AIPMT - 2010
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To view explanation, please take trial in the course.
NEET 2023 - Target Batch - Aryan Raj Singh