A student demonstrates electrostatic induction using a copper sphere mounted on an insulating stand. A negatively charged rod is held near the left side of the sphere. The right side of the sphere is connected to the earth via a copper wire, as shown in the diagram.
Which row correctly identifies the electrical classification of the copper sphere, the mobile charge carriers that flow through the wire, and the direction of their initial flow?
Classification: Electrical insulator ∣\mid∣ Charge carriers: Positive ions ∣\mid∣ Direction of flow: From the earth to the sphere
Classification: Electrical conductor ∣\mid∣ Charge carriers: Electrons ∣\mid∣ Direction of flow: From the sphere to the earth
Classification: Electrical conductor ∣\mid∣ Charge carriers: Electrons ∣\mid∣ Direction of flow: From the earth to the sphere
Classification: Electrical conductor ∣\mid∣ Charge carriers: Positive ions ∣\mid∣ Direction of flow: From the sphere to the earth