A positive charge of 1000 C is located in a uniform field of

A positive charge of 1.000 C is located in a uniform field of 9.00×104 N/C. A negative charge of -0.100 C is brought near enough to the positive charge that the attractive force between the charges just equals the force on the positive charge due to the field. How close are the two charges?

Solution

Here ,

let the sepeartion between the charges is d

Now , force between charges = force on charge 1 due to electric field

k * q1 * q2/d^2 = E * q1

9 *10^9 * 0.1 *10^-6/d^2 = 9 *10^4

solving for d

d = 0.1 m

the distance between the charges must be 0.1 m