Electromagnets, Generators and Motors

Two identical neutral metal spheres rest on an insulated table. Sphere 1 is given a net positive charge while sphere 2 is given a net negative charge. Which statement explains the movement of charges during the charging process?

•  protons were added to sphere one;  electrons were added to sphere 2

  
  

•  protons were added to sphere 1 and protons were removed from sphere 2

  
  

•  electrons were removed from sphere one and electrons were added to sphere 2

  
  

•  electrons were removed from sphere one and protons were removed from sphere 2

  
  

Tags

NGSS.HS-PS3-5

NGSS.HS-PS2-4

Which scenario is the best analogy to the work done on a negative charge to move it toward a negatively charged Electric plate?

•  a cup falling to the ground

  
  

•  a book lifted from the ground

  
  

•  I released spring launching a pinball

  
  

•  a curling Stone pushed Along frictionless Ice

  
  

Tags

NGSS.HS-PS3-5

NGSS.HS-PS2-4

Which conclusion is supported by the data?

•  the magnetic field produced is inversely proportional to the length of the wire.

  
  

•  the electric field is produced is directly proportional to the length of the wire.

  
  

•  the electric field produced is inversely proportional to the number of coils.

  
  

•  the magnetic field produced is directly proportional to the number of coils.

  
  

Tags

NGSS.MS-PS2-3

One student rubs a balloon against his hair several times. another student passes a comb through her hair several times. The students place the comb near the balloon and observe that the comb repels the balloon. Which is the most likely reason the comb is able to repel the balloon?

•  the balloon has a positive charge in the comb is neutral.

  
  

•  the balloon and the comb have the same electrical charge.

  
  

•  the balloon has a negative charge in the comb has a neutral period

  
  

•  the balloon and the comb have opposite electric charges.

  
  

Tags

NGSS.MS-PS2-3

NGSS.MS-PS2-5

  select all of the factors that affect the strength of an electromagnet.

•  number of times the wire is looped around the core

•  size of the object being attracted by the core.

  
  

•  amount of material in the core.

  
  

•  type of material in the core.

  
  

•  voltage of the battery 

  
  

Tags

NGSS.MS-PS2-3

Which statement describes the relationship between electric generators and Electric motors?

•  generators transform electrical energy into mechanical energy whereas electric motors transform mechanical energy into electrical energy

  
  

•  generators transform mechanical energy into electrical energy whereas electric motors transform electric energy into mechanical energy 

  
  

•  both electric generators and electric motors transform current from a magnetic field into a mechanical field

  
  

•  both electric generators and electric motors use Motion in a magnetic field to produce electric current

  
  

Tags

NGSS.HS-PS3-3

An electric corporation opened a manufacturing facility in Crystal springs, mississippi, in 1956 to expand their power transformer product line. how would this impact a transfer of electrical energy?

•  producing more Transformers ensures there is equipment available for the purpose of generating more electricity

  
  

•  Transformers are used in substations to reduce the voltage in power lines so it can safely enter homes

  
  

•  it will allow power plants to convert mechanical energy into electrical energy more efficiently 

  
  

•  Transformers are used to reduce the voltage of electricity so it can be transmitted efficiently over long distances

  
  

Tags

NGSS.HS-PS3-5

NGSS.HS-PS3-3

What is the function of the cylindrical object mounted to this utility pole?

•  to reduce electrical potential energy and a power line to near zero before current flows into the house

  
  

•  to increase or decrease voltage in a power line with little significant loss of energy

  
  

•  to generate electric power in the power line as the electric current flows throughout the device

  
  

•  to increase or decrease significantly both energy and voltage in a power line

  
  

Tags

NGSS.HS-PS3-5

NGSS.HS-PS3-3

Which investigation demonstrates a non-contact force?

•  place a non-metallic object on the South Pole of the horseshoe magnet and observe that the object does not move to the North Pole of the magnet 

  
  

•  place a metal object near the horseshoe magnet and observe that the object moves toward the magnet

  
  

•  place a metal object on the horseshoe magnet and observe that the object remains in place when the magnet is picked up

  
  

•  place a non-metallic object near the horseshoe magnet and observe that the object does not move

  
  

Tags

NGSS.MS-PS2-5

What is created by the flow of electric current?

• magnetic field

• electric field

•  a resistor 

•  a battery