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QJEEM21Ph3e3f: JEE Main 2021 Physics - Class 12 JEEM21Ph3e3f Solution: Two particles A and B having charges 20 μ C and − 5 μ C…

Two particles A and B having charges 20μC and −5μC respectively are held fixed with a separation of 5 cm. At what position a third charged particle should be placed so that it does not experience a net electric force?

JEE Main 2021 (Online) 31st August Morning Shift Physics - Electrostatics Question 115 English

Multiple Choice Options

  • A At 5 cm from 20 μC on the left side of system
  • B At 5 cm from −5 μC on the right side
  • C At 1.25 cm from −5 μC between two charges
  • D At midpoint between two charges

Step-by-Step Verified Solution

Null point is possible only right side of −5 μC

JEE Main 2021 (Online) 31st August Morning Shift Physics - Electrostatics Question 115 English Explanation

EN=+k(−5μC)x2+k(20μC)(5+x)2=0

x = 5 cm

∴ Option (b) is correct.

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