First slide

Electric field

Question

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

Moderate

A

20 cm
B

10 cm
C

33 cm
D

None of these

Solution

Suppose electric field is zero at N. Hence $|E_{A}| = |E_{B}|$
Which gives $x_{1} = \frac{x}{\sqrt{\frac{Q_{2}}{Q_{1}}} + 1} = \frac{80}{\sqrt{\frac{20}{10}} + 1} = 33 cm$

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