3. Two identical rubber balls are electrically charged and placed within an insulated frictionless glass bowl and come to rest as shown in the diagram. m= 10 g R= 20 cm R HE i. Determine the location where an identical charge must be placed so the the net electric field is zero at the centre of the top of the bowl. ii. Determine the work an external force must do to move the identical charge from the far reaches of space to the position determined in part ii. Slied that