neutral Amber is rubbed with neutral polyester fabric. then the Amber is brought near a neutral metal sphere. the sphere is grounded on the opposite side of the Amber. the sphere is disconnected from the grounding wire. the Amber rod is moved away. what is the new charge of the metal sphere?

Engineers find a new metal that is stronger than steel but much lighter. this material is also significantly cheaper than what is currently used for most aircraft, available in large quantities, and easy to manufacture. the engineers are excited because this new material will lower the costs of buying and operating airplanes for companies. what is probably the best step for the engineers to make next?