An insulating sphere of radius 0170m has uniform charge

Question

Problem: An insulating sphere of radius 0.170m has uniform charge density 7.30 × 10⁹ C/m³. A small object that can be treated as a point charge is released from rest just outside the surface of the sphere. The small object has positive charge 3.30 × 10⁶ C.

Part A: Find the work of electric field.

Please explain all work and steps to find the work of electric field.