Aparticle (charge 7.5 μc) is released from rest at a point on the x axis, x = 10 cm. it begins to move due to the presence of a 2.0-μc charge which remains fixed at the origin. what is the kinetic energy of the particle at the instant it passes the point x = 1.0 m? (a) 3.0 j(b) 1.8 j(c) 2.4 j(d) 1.2 j(e) 1.4 j

The correct answer is option 'D': 1.2 Joules

Explanation:

Since the energy associated with the electric field is conservative thus we conclude that the

Kinetic energy of the moving particle equals the change in electrostatic potential energy.

For the initial case

Now V associated with the 2.0μC charge is

Applying the given values we get

When the moving charge reaches x = 1.0 meter the energy becomes

Thus the change in energy is

mistakes are ok

grav force prop 1/r squared 2r all squared is 4rsquared 1/4rsquared quartered