Electricity and magnetism

_____________ means the ability to do work.

• Magnet

• Energy

• Food

The S.I. unit for energy is________

• voltage(V)

• watt(W)

• joule (J).

Energy cannot be created nor destroyed but it can exist in various forms

• True

• False

When a balloon is rubbed on clothes it acquires a charge by ___________

• friction

• induction

• reduction

When a glass rod is rubbed with silk and the glass rod becomes positively charged, what happens to the electrons?

• they are removed from the rod

• they are added to the rod

During a physics lab, a plastic strip was rubbed with cotton and became positively charged. The correct explanation for why the plastic strip becomes positively charged is that ...

• the plastic strip acquired extra protons from the charging process

• the plastic strip acquired extra protons from the cotton.

• the plastic strip lost electrons to the cotton during the charging process

A glass rod becomes positively charged when it is rubbed with silk. This net positive charge accumulates because the glass rod

• gains electrons

• loses protons

• loses electrons

A balloon is rubbed against a student's hair and then touched to a wall. The balloon sticks to the wall due to

• magnetic forces between the particles of the balloon and the particles of the wall

• electrostatic forces between the particles of the balloon and the particles of the wall

• electrostatic forces between the particles of the balloon

When a plastic rod is rubbed with wool, the wool acquires a positive charge because

• protons are transferred from the wool to the rod

• electrons are transferred from the wool to the rod

• electrons are transferred from the rod to the wool

The object that has equal number of protons and electrons is known as ___________.

• positive

• negative

• neutral