•  A negatively charged particle is moved into the field generated by a positive charge.
• (a) Draw the field lines around both charges.
• (b) The negative charge is 52 nC and the positive charge is 27 nC.
•  i. Calculate the separation between the two charges if the force between them is 4.5 x 10^-5 N.
•  ii. What happens to the force if this distance is halved?
•  (c) i. Calculate how much work is done if the negative charge is moved to a distance of 75 cm from the positive charge. 
• ii. State whether the negative charge gains or loses potential energy.