Distribution of Charges

Which is the electric field of a positive charge?

• Left

• Right

Tags

NGSS.HS-PS2-4

Two electrically neutral metal spheres, A and B, on insulating stands are placed in contact with each other. A negatively charged rod is brought near, but does not touch the spheres, as shown in the diagram below. How are the spheres now charged?

• A is positive and B is positive.

• A is negative and B is positive.

• A is positive and B is negative.

• A is negative and B is negative.

Tags

NGSS.HS-PS3-5

Three charged metal spheres, X, Y, and Z, are on insulating stands. All three spheres are simultaneously brought into contact with each other and then returned to their original positions.
Which statement best describes the charge of the spheres after this procedure is completed?

• All the spheres will end up with the same charge

• All the spheres are neutral

• Sphere Y has a greater charge than spheres X or Z

• Each sphere retains the same charge that it had originally

A negatively charged rod touches the knob of a neutral electroscope. Which  best represents the distribution of charge on the electroscope.

• both the knob and leaves become positive

• both the knob and leaves become negative

• the knob becomes negative and the leaves become positive

• the knob becomes positive and the leaves become negative

During a physics lab, a plastic strip was rubbed with cotton and became positively charged. The correct explanation for why the plastic strip becomes positively charged is that ...

• the plastic strip acquired extra protons from the cotton.

• the plastic strip acquired extra protons from the charging process 

• protons were created as the result of the charging process

• the plastic strip lost electrons to the cotton during the charging process 

Tags

NGSS.HS-PS1-2

A glass rod becomes positively charged when it is rubbed with silk. This net positive charge accumulates because the glass rod

• gains electrons

• loses electrons

• gains protons

• loses protons

Tags

NGSS.MS-PS2-3

A negatively charged plastic comb is brought close to, but does not touch, a small piece of paper. If the comb and the paper are attracted to each other, the charge on the paper

• must be positive

• must be negative

• may be neutral or negative

• may be neutral or positive 

Tags

NGSS.HS-PS2-4

NGSS.HS-PS3-5

Two electrically charged identical-sized metal spheres, A (charge of -4) and B (charge of +8). If the spheres are brought into contact, which sphere will have a net gain of electrons?

• both A and B

• neither

• only A

• only B

Tags

NGSS.HS-PS3-5

A positively charged rod is held near the knob of a neutral electroscope. What best describes what will happen to the leaves?

• the leaves will spread apart and be positive

• the leaves will spread apart and be negative

• the leaves will stay closed and be positive

• the leaves will stay closed and be negative

Tags

NGSS.MS-PS2-3

Metal sphere A has a charge of +12 elementary charges and identical sphere B has a charge of +16 elementary charges. After the two spheres are brought into contact and separated, the charge on sphere A is

• +14 elementary charges

• +28 elementary charges

• +2 elementary charges

• -2 elementary charges