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Electric Potential at a Point in Space Due to a Point Charge Q

In the given ...

Question

In the given figure distance of the point from A where the electric field is zero is

20 cm

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10 cm

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33 cm

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None of these

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Solution

The correct option is C 33 cm
Suppose electric field is zero at N. Hence $| E_{A} | = | E_{B} |$

Which gives $x_{1} = \frac{x}{\sqrt{\frac{Q_{2}}{Q_{1}}} + 1} = 33 c m$

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