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Chapter 14: Q47P (page 583)

A negatively charged iron block is placed in a region where there is an electric field downward (in the Y − direction) due to charges not shown. Which of the diagrams (a–f) in Figure 14.88 best describes the charge distribution in and/or on the iron block?

Short Answer

Expert verified

Diagram (b) best describes the charge distribution in and on the iron block

Step by step solution

01

Significance of the law of attraction

The law of attraction states that positive charges attract negative charges and the negative charges attract positive charges.

The concept of the law of attraction describes the charge distribution inside the iron block.

02

Determination of the charge distribution in and on the iron block

As the iron block is previously charged negative and the net electric field is in the downward direction, that is in the y -direction, then it is evident that the positive charges will move in the direction of the electric field and the negative charges will move opposite to the direction of the electric field.

Diagram (a) shows that the positive charges are upward and the negative charges are downward. This diagram is incorrect as the negative charges will be upward as the electric field is downward.

Diagram (c) shows that all the negative charges are on the iron block. This diagram is incorrect as the positive charges should also be there. Also, the quantity of charge is also not the same.

Diagram (d) shows that all the negative charges are on the iron block. This diagram is incorrect as the positive charges should also be there. Also, the quantity of charge is also not the same.

Diagram (e) shows that all the negative charges are inside the iron block. This diagram is incorrect as the positive charges should also be there.

Diagram (f) shows that all the negative charges are outside the iron block. This diagram is incorrect as the positive charges should also be there.

Diagram (b) shows that the negative charges are upward and the positive charges are downward. This diagram is correct as the negative charges will be upward as the electric field is downward as the positive charges move in the direction of the electric field and the negative charges move opposite of the field.

Thus, diagram (b) best describes the charge distribution in and on the iron block.

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Most popular questions from this chapter

Which statements about a neutral atom are correct? Select all that apply. (1) A neutral atom is composed of positively and negatively charged particles. (2) The positively charged particles in the nucleus are positrons. (3) The electrons are attracted to the positively charged nucleus. (4) Positively charged protons are located in the tiny, massive nucleus. (5) The radius of the electron cloud is twice as large as the radius of the nucleus. (6) The negatively charged electrons are spread out in a "cloud" around the nucleus.

You have three metal blocks marked A, B, and C, sitting on insulating stands. Block A is charged, but blocks B and C are neutral (Figure 14.76).

Without using any additional equipment and without altering the amount of charge on block A, explain how you could make block B be chargedand block C be charged. Explain your procedure in detail, including diagrams of the charge distributions at each step in the process.

Here is a variant of “charging by induction.” Place two uncharged metal objects so as to touch each other, one behind the other. Call them front object and back object. While you hold a charged comb in front of the front object, your partner moves away the back object (handling it through an insulator so as not to discharge it). Now you move the comb away. Explain this process. Use only labeled diagrams in your explanation (no prose!).

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The mobility of Na+ions in water is5.2×10-8(m/s)(N/C). If an electric field of2400N/Cis maintained in the fluid, what is the drift speed of the sodium ions?
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