{"knowledge_schema": {"broad_category": "Physics \u2192 Electromagnetism \u2192 Electric Fields", "refinement": "This problem deals with the behavior of electric fields generated by moving point charges, particularly when the charge stops moving.", "specific_scope": "The focus is on determining the electric field at a point in space after a point charge has stopped moving, taking into account the effects of its previous motion.", "goal": "To derive the expression for the electric field at a point in space due to a point charge that has stopped moving, using the principles of electromagnetism."}, "summary": "This problem involves understanding how the electric field behaves when a point charge, initially moving with a constant velocity, suddenly stops. The key is to recognize that the electric field at a point in space is influenced by the charge's previous motion. The correct expression for the electric field at a later time after the charge has stopped is derived from the principles of electromagnetism, specifically considering the effects of the charge's velocity and the propagation of electromagnetic effects at the speed of light."}