Electrostatics Question 421

Question: Distance of the point from A where the electric field is zero is [RPMT 2000]

Options:

A) 20 cm

B) 10 cm

C) 33 cm

D) None of these

Show Answer

Answer:

Correct Answer: C

Solution:

Suppose electric field is zero at N. Hence Which gives$ x _{1}=\frac{x}{\sqrt{\frac{Q _{2}}{Q _{1}}}+1}=\frac{80}{\sqrt{\frac{20}{10}+1}}=33cm $ .



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