Final answer:
The electric field of a conductor with +3 nC of excess charge can be represented by electric field lines that emanate outward from the conductor. The direction and strength of the electric field can be determined based on the charge. The electric field strength decreases with distance from the conductor.
Step-by-step explanation:
The electric field of a conductor with +3 nC of excess charge can be represented by electric field lines that emanate outward from the conductor. These electric field lines indicate the direction and strength of the electric field. Since the excess charge is positive, the electric field lines will point away from the conductor. The strength of the electric field decreases with distance from the conductor according to the inverse square law.