WS13A Electric Charges

____ are ____ charged.

• protons, negatively

• protons, positively

• electrons, negatively

• electrons, positively

The SI unit for charges is the ______, with the symbol ___.

Neutral objects have ____

• no charge

• more positive than negative charges

• more negative than positive charges

• same number of positive and negative charges

_____ charged objects have ____

• Negatively, more protons than electrons

• Negatively, more electrons than protons

• Positively, more protons than electrons

• Positively, more electrons than protons

_____ charges ____

• Like, attract

• Like, repel

• Unlike, attract

• Unlike, repel

Two positively charged rods attract each other.

To ____ the strength of the attraction, we need to ____ the charges on the rods.

• increase, decrease

• increase, increase

• decrease, decrease

• decrease, increase

Vehicles moving through the air at high speeds can accumulate charges due to friction between them and the air. A sudden discharge of the charges may cause sparks and is dangerous for vehicles carrying flammable materials. There is metal chain that connects the truck to the ground. Why is this so?

• The charges on the vehicle will flow from the chain into the ground as the vehicle moves

• The charges on the vehicle will flow from the vehicle into the chain as the vehicle moves

• The charges will

  not accumulate on the vehicle to cause sparks.

• The charges will

  accumulate instead on the chain and prevent sparks.