Charging by Conduction and Induction

____________ are negatively charged.

• electrons

• protons

______________are positively charged.

• electrons

• protons

__________________resides in the nucleus of atoms and are tightly bound.

• electrons

• protons

________________ will never leave as a result of electrostatic procedures.

• electrons

• protons

_______________ are located on the outside of the nucleus and are easily removed from or added to atoms.

• electrons

• protons

As an object begins to gain or lose ______________________ from its atoms, it becomes positively or negatively charged.

• electrons

• protons

A negatively charged object has more _________________ than _____________________.

• electrons than protons

• protons than electrons

A positively charged object has more ______________ than __________________.

• electrons than protons

• protons than electrons

A metal sphere is resting upon an insulating stand. A teacher holds a metal bar (with an insulating handle). The teacher uses the metal bar to charge the sphere by conduction. Which one of the processes describes what the teacher likely did to charge the sphere by conduction?

• the teacher rubbed the bar and the sphere together

• the teacher held the bar near the sphere and then touched the sphere with her hand

• the teacher charge the bar and then contacted it to the sphere

Consider the conduction charging process shown in the picture.

A: A teacher holds a negatively charged metal bar by its insulating handle and touches it to a metal sphere (attached to an insulating stand).

B: The teacher pulls the metal bar away an d the metal sphere acquires a charge.

C: The excess negative charge spreads uniformly about the surface of the metal sphere.

Diagram A is the charging step. How does this sphere become charged?

• Electrons move from the insulating stand into the sphere

• Electrons move from the charged metal bar into the sphere

• Protons move from the sphere into the negatively charged bar