Question

Two charges 2mc and -50mc are placed 80cm apart.calculate thw distance of rhe point from the smaller charge where intensity is zero

Answer 1

using the formula of intensity. E= kQ/d^2. you need both of the intensities to be equal. K will cancel out each other. You can substitute one of the distance by subtracting it from 80. That way you’ll have one unknown and a quadratic equation to solve. By solving you should get the answer 66.67 from the -50mC charge