Electrostatics

Electrostatics

Multiple Choice

Electric charges exert which kind of force?

• a field force

• a contact force

• a gravitational force

• a frictional force

Multiple Choice

Why does the balloon stick to the wall?

• There is tape on it

• The gravitational pull of the wall

• The electrons in the wall move away making the wall positive

• The friction of the walls surface

Multiple Choice

A negatively charged object and a neutral object can be repelled.

• True

• False

Multiple Choice

What direction do the field lines point for a positive charge?

• Away from the charge

• Toward the charge

• Perpendicular to the charge

Multiple Choice

What does it mean when the electric field lines are close together?

• the field is positive
• the field is negative
• The field is strong
• the field is weak

Multiple Choice

Which type of charges do these balloons have?

• like charges

• opposite charges

Multiple Choice

The accumulation of excess electric charge on an object is called

• Static electricity

• Electric discharge

• Resistance

• Circuit

Multiple Choice

Two like charges

• neutralize each other.

• repel each other.

• must be neutrons.

• attract each other.

Multiple Choice

Which of the following labeled points is in the region with the strongest force of electric charge

• A
• B
• C
• D

Multiple Choice

What direction are the electric field lines around an electron?

• towards the charge
• away from the charge

Multiple Choice

An atom loses an electron.  What type of charge does it have now?

• positive
• negative

Multiple Choice

Which net charge could be found on an object?

• 4.8 x 10^-19 C

• 1.8 x 10^-19 C

• 3.0 x 10^-19 C

• 2.8 x 10^-19 C

Multiple Choice

A metal sphere having an excess of +5 elementary charges has a net electric charge of

• 8.0 x 10^-19 C
• 8.0 x 10¹⁹ C
• 1.6 x 10^-19 C
• 5.0 x 10^-19 C

Multiple Choice

What variable do Coulombs represent?

• Electrostatic Charge
• Force
• Distance
• Mass

Multiple Choice

When distance increases, electrostatic force ____________; we call this relationship ____________ proportional

• decreases;directly

• decreases;inversely

• increases;inversely

• increases;directly

Multiple Choice

The Electric Force is strongest when charges are...

• close together

• far apart

• the electric force is constant everywhere

Multiple Choice

Recap:

Coulomb’s law states that the force between two charged objects will __________ when the magnitude of the object’s charge increases.

Coulomb’s law also states that the force between two charged objects will __________ when the distance between objects increases.

• increase; increase

• increase; decrease

• decrease; increase

• decrease; decrease

Multiple Choice

Electrostatic force F is directly proportional to:

• r^2 (distance squared)
• q1
• q2
• both q1 and q2

Multiple Choice

When distance increases, electrostatic force ____________; we call this relationship ____________ proportional

• decreases;directly
• decreases;inversely
• increases;inversely
• increases;directly

Multiple Choice

If the distance doubles, what happens to the force?

• Reduced by half
• Reduced by 1/4
• Stays the same
• Quadruples

Multiple Choice

Which is the value of the constant in Coulomb's equation?

• k = 9·10^-9

• k = 9.8

• k = 6.67·10^-11

• k = 9 ·10⁹

Multiple Choice

Which is the value of the constant in Coulomb's equation?

• k = 9·10^-9

• k = 9.8

• k = 6.67·10^-11

• k = 9 ·10⁹

Multiple Choice

Two similar metal spheres, A and B, have charges of +2.0 x 10^-6 coulomb and +1.0 x 10^-6 coulomb, respectively. The magnitude of the electrostatic force on A due to B is 4.0N newtons. What is the magnitude of the electrostatic force on B due to A?

• 2.0N
• 4.0N
• 8.0N
• 1.0N

Multiple Choice

Which of the following is not a good insulator?

• Copper
• Glass
• rubber
• wool

Multiple Choice

What is the total charge on this system?

• -6μC

• -3μC

• 3μC

Multiple Choice

What is the total charge on this system?

• -8μC

• 8μC

• 0C

Multiple Choice

What is the total charge on this system?

• -8μC

• 8μC

• 0C

Charging an object

Multiple Choice

A charged balloon is brought near an electroscope but DOES NOT touch the electroscope.  This is an example of charging by

• Conduction
• Convection
• Friction
• Induction

Multiple Choice

Rubbing a balloon on hair is an example of static charge build up created by....

• conduction
• friction
• induction
• hairduction

Multiple Choice

Transferring a charge without touching is ___

• conduction
• induction
• grounding 
• Newtons 3rd law

Multiple Choice

Removing a static charge by providing a path to the ground is called __.

• electric transfer

• grounding

• switching

• seperation

Multiple Choice

Removing a static charge by providing a path to the ground is called __.

• electric transfer
• grounding
• switching
• seperation