Question

object a and object b are insulators. they are both neutral. object b is touched by a negatively-charged, insulating sphere. when the sphere is pulled away, what charge do the objects have? key
□ = conductor
■ = insulator
tap to toggle through possible options for type of charge:
type of charge on a: neutral (0)
type of charge on b: tap here.

Explanation:

Step1: Recall insulator charging behavior

Insulators do not allow free movement of charges. When a charged object touches an insulator, the charge transfer is limited to the point of contact (or a small area) because charges can't move freely through the insulator.

Step2: Analyze Object A

Object A is an insulator and not in direct contact with the negatively - charged sphere. Since charges can't move freely through insulators, Object A remains neutral.

Step3: Analyze Object B

Object B is an insulator that is touched by a negatively - charged insulating sphere. When the negatively - charged sphere touches Object B, some of the negative charge from the sphere will transfer to Object B at the point of contact. Since Object B is an insulator, the charge will stay localized but Object B will acquire a negative charge.

Answer:

Type of Charge on A: Neutral (0)
Type of Charge on B: Negative