Electricity

Aluminum sphere A contains a small negative charge and is touched by aluminum sphere B, which has a larger negative charge. Which of the following occurs next?

• Protons flow from sphere B to sphere A.

• Protons flow from sphere A to sphere B.

• Electrons flow from sphere B to sphere A.

• Electrons flow from sphere A to sphere B.

Tags

NGSS.HS-PS2-4

NGSS.HS-PS3-5

Which of the following describes an object that must have a net negative charge?

• It contains more molecules than atoms.

• It contains more electrons than protons.

• It is carrying an electric current.

• It is made of metal.

If the distance separating an electron and a proton is halved, the magnitude of the electrostatic force between these charged particles will be

• unchanged

• doubled

• quartered

• quadrupled

Tags

NGSS.HS-PS2-4

Two similar metal spheres, A and B, have charges of +2.0 x 10^–6 coulomb and +1.0 x 10–6 coulomb, respectively, as shown in the diagram. The magnitude of the electrostatic force on A due to B is 2.4 newtons. What is the magnitude of the electrostatic force on B due to A?

• 1.2 N

• 2.4 N

• 4.8 N

• 9.6 N

Tags

NGSS.HS-PS2-4

Metal sphere A has a charge of –2 units and an identical metal sphere, B, has a charge of –4 units. If the spheres are brought into contact with each other and then separated, the charge on sphere B will be

• 0 units

• –2 units

• –3 units

• +4 units

Tags

NGSS.HS-PS2-4

Gravitational forces differ from electrostatic forces in that gravitational forces are

• attractive, only

• repulsive, only

• neither attractive nor repulsive

• both attractive and repulsive

Tags

NGSS.HS-PS2-4

Two small metallic spheres, A and B, are separated by a distance of 4.0 X 10^–1 meter, as shown. The charge on each sphere is 1.0 x 10^–6 coulomb. Point P is located near the spheres. What is the magnitude of the electrostatic force between the two charged spheres?

• 2.2 x 10^–2 N

• 5.6 x 10^–2 N

• 2.2 x 10⁴ N

• 5.6 x 10⁴ N

Tags

NGSS.HS-PS2-4

The current through a 10.-ohm resistor is 1.2 amperes. What is the potential difference (voltage) across the resistor?

• 8.3 V

• 12 V

• 14 V

• 120 V

A 6.0-ohm lamp requires 0.25 ampere of current to operate. In which circuit below would the lamp operate correctly when switch S is closed?

• 
• 
• 
• 

In the circuit diagram below, two 4.0-ohm resistors are connected to a 16-volt battery as shown. The total current in the circuit is

• 4 A

• 2 A

• 0.5 A

• 0.25 A