Electrostatics

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

• may be positive or neutral

• must be positive

• may be negative or neutral

• must be negative

Tags

NGSS.MS-PS2-3

A balloon is rubbed against a student's hair and then touched to a wall. The balloon "sticks" to the wall due to

• electrostatic forces between the particles of the balloon and the particles of the wall

• magnetic forces between the particles of the balloon and the particles of the wall

• electrostatic forces between the particles of the balloon

• magnetic forces between the particles of the wall

Tags

NGSS.HS-PS2-4

An electroscope is a device with a metal knob, a metal stem, and freely hanging metal leaves used to detect charges. The diagram below shows a positively charged leaf electroscope.

As a positively charged glass rod is brought near the knob of the electroscope, the separation of the leaves will

• remain the same

• increase

• decrease

A positively charged glass rod attracts object X. The net charge of object X

• may be zero or positive

• may be zero or negative

• must be positive

• must be negative

Tags

NGSS.HS-PS2-4

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

• gains electrons

• loses protons

• loses electrons

• gains protons

Tags

NGSS.HS-PS2-4

When a neutral metal sphere is charged by contact with a positively charged glass rod, the sphere

• loses protons

• gains protons

• loses electrons

• gains electrons

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, what is the charge on sphere A?

• -2 elementary charges

• +14 elementary charges

• +28 elementary charges

• +2 elementary charges

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 negative.

• A is negative and B is negative.

• A is positive and B is positive.

• A is negative and B is positive.

Tags

NGSS.MS-PS2-3

The diagram above shows three neutral metal spheres, x, y, and z, in contact and on insulating stands. Which diagram best represents the charge distribution on the spheres when a positively charged rod is brought near sphere x, but does not touch it?

• 
• 
• 
• 

The diagram above shows two identical metal spheres, A and B, on insulated stands. Each sphere possesses a net charge of -3 x 10^-6 coulomb. If the spheres are brought into contact with each other and then separated, the charge on sphere A will be

• -6 x 10^-6 C

• +3 x 10^-6 C

• -3 x 10^-6 C

• 0 C

Tags

NGSS.HS-PS2-4