Forces and Force Fields

An electron e and a proton p are simultaneously released from rest in a uniform electric field E, as shown above. Assume that the particles are sufficiently far apart so that the only force acting on each particle after it is released is that due to the electric field. At a later time when the particles are still in the field, the electron and the proton will have the same

• direction of motion

• speed

• displacement

• magnitude of acceleration

• magnitude of force acting on them

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NGSS.HS-PS2-1

NGSS.HS-PS2-4

The diagram above shows electric field lines in an isolated region of space containing two small charged spheres, Y and Z. Which of the following statements is true?

• The charge on Y is negative and the charge on Z is positive.

• The strength of the electric field is the same everywhere.

• The electric field is strongest midway between Y and Z

• A small negatively charged object placed at point X would tend to move toward the right.

• Both charged spheres Y and Z carry charge of the same sign.

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NGSS.HS-PS2-4

NGSS.HS-PS3-5

Two charged particles, each with a charge of +q, are located along the x–axis at x = 2 and x = 4, as shown above. Which of the following shows the graph of the magnitude of the electric field along the x–axis from the origin to x = 6?

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NGSS.HS-PS2-4

NGSS.HS-PS3-5

A battery is hooked up to a parallel plate capacitor and creates an electric field E between the plates. Between the plates exists a small particle of mass m that is levitated by the electric field.

What is the charge on the particle?

• No charge

• Positive

• Negative

• The charge does not matter

• Not enough information provided

Tags

NGSS.HS-PS2-4

NGSS.HS-PS2-5

NGSS.HS-PS3-5

A battery is hooked up to a parallel plate capacitor and creates an electric field E between the plates. Between the plates exists a small particle of mass m that is levitated by the electric field.

Which of the following represents the charge on the particle?

• mgE

• mg/E

• E/mg

• Em/g

• zero

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NGSS.HS-PS2-4

NGSS.HS-PS2-5

NGSS.HS-PS3-5

Two charges are arranged on the corners of a square as shown below. What is the direction of the net electric field at the center of the square?

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NGSS.HS-PS2-4

Two charges are arranged on the corners of a square as shown below. At which point is the magnitude of the field is strongest?

• A

• B

• C

• D

• E

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NGSS.HS-PS3-5

The figure above shows two particles, each with a charge of +Q, that are located at the opposite corners of a square of side d. What is the direction of the net electric field at point P ?

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NGSS.HS-PS2-4

The figure above shows two particles, each with a charge of +Q, that are located at the opposite corners of a square of side d. What is the potential energy of a particle of charge +q that is held at point P ?

• Zero

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NGSS.HS-PS2-4

The figure above shows the electric field in a region surrounding four charged particles, labeled 1, 2, 3, and 4, that are held in place. (Vectors with very large magnitude are not shown.) A small positive test charge is held at point P. Which of the following is closest to the direction of the force exerted on the test charge?

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Tags

NGSS.HS-PS3-5