You rub a plastic comb through your hair and it now carries a charge of ?6.0 ? 1

Question

You rub a plastic comb through your hair and it now carries a charge of ?6.0 ? 10?9 C. What is the charge on your hair?
                         C

Which of the following could be reasonable explanations for how a piece of invisible tape gets charged? Select all that apply.

Protons are pulled out of nuclei in one tape and transferred to another tape.

Electrons are pulled out of molecules in one tape and transferred to another tape.

Neutrons are pulled out of nuclei in one tape and transferred to another tape.

Charged molecular fragments are broken off one tape and transferred to another.

You rub a clear plastic pen with wool, and observe that a strip of invisible tape is attracted to the pen. Assuming that the pen has a net negative charge, which of the following could be true? Select all that apply.

The tape might be positively charged.

The tape might be negatively charged.

The tape might be uncharged.

There is not enough information to conclude anything.

Which statements about a neutral atom are correct? Check all that apply.

1 The negatively charged electrons are spread out in a "cloud" around the nucleus.

2 The positively charged particles in the nucleus are positrons.

3 Positively charged protons are located in the tiny, massive nucleus.

4 The radius of the electron cloud is twice as large as the radius of the nucleus.

5 A neutral atom is composed of both positively and negatively charged particles.

6 The electrons are attracted to the positively charged nucleus.

There is a region where an electric field points to the right, due to charged particles somewhere. A neutral carbon atom is placed inside this region. Draw a diagram of the situation. Which of the following statements are correct? Check all that apply.

1 The nucleus of the carbon atom shifts to the left.

2 Because the net charge of the carbon atom is zero, it can not be affected by an electric field.

3 The electron cloud in the carbon atom shifts to the left.

4 The neutral carbon atom polarizes, and becomes a dipole.

A charged tape is brought near your hand, as shown in the diagram above. Your hand is initially neutral.

If the tape is negatively charged, which diagram best shows the polarization of a neutral molecule in your hand?

                    

What is the direction of the electric field at the location of the tape, due to the large number of polarized molecules in your hand?

What is the direction of the force on the tape, due to the polarized molecules in your hand?
                    
What is the direction of the force on your hand, due to the charged tape?
                    

Explanation / Answer

1. + 6 x 10^-6 C

2.. Electrons are pulled out of molecules of one tape and are transferred to another.

3. The tape might be positively charged. or The tape might be uncharged.

Because if the tape is positively charged the pen defnitely attracts the tape, even if its uncharged electrons may repel and go far from pen and leaving that area near pen to be positively charged to be attracted.

4.

5

6. If q1 is positive which diagram best shows the charge distribution of the neutral atom in this situation?

Diagram 6 best describes as nucleus of neutral atom is above the q1 and hence the cloud tilts and negative charge accumaltes to the left attracting to q1.

7. electric field is outward so it is b towards diagonal right-top for charged partile

8. direction of electric field is also towards b for neutral atom

9. Direction of force when a tap is bought near a hand is towards c.

10. in the case 2 descrbies whene tape is negatively charged and hand is bought near it.

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