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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

You observe that a negatively charged plastic pen repels a charged piece of invisible tape. You then observe that the same piece of tape is repelled when brought near a metal sphere. You are wearing rubber-soled shoes, and you touch the metal sphere with your hand. After you touch the metal sphere, you observe that the tape is attracted to the metal sphere. Which of the following statements could be true? Check all that apply. (1) Electrons from the sphere traveled through your body into the Earth. (2) Electrons from the sphere moved into the salt water on your skin, where they reacted with sodium ions. (3) After you touched it, the metal sphere was very nearly neutral. (4) Chloride ions from the salt water on your hand moved onto the sphere. (5) The excess negative charge from the sphere spread out all over your body. (6) Electrons from your hand moved onto the sphere. (7) Sodium ions from the salt water on your hand moved onto the sphere.

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.

A solid plastic ball has negative charge uniformly spread over its surface. Which of the diagrams in Figure 14.85 best shows the polarization of molecules inside the ball?

(a)The positively charged particle shown in diagram 1 in Figure 14.94 creates an electric field \({{\bf{\vec E}}_{\bf{p}}}\) at location A. Which of the arrows (a–j) in Figure 14.94 best indicates the direction of \({{\bf{\vec E}}_{\bf{p}}}\) at location A?

(b)Now a block of metal is placed in the location shown in diagram 2 in Figure 14.94. Which of the arrows (a–j) in Figure 14.94 best indicates the direction of the electric field \({{\bf{\vec E}}_{\bf{m}}}\) at location Adue only to the charges in and/or on the metal block?

(c)\(\left| {{{{\bf{\vec E}}}_{\bf{p}}}} \right|\)is greater than \(\left| {{{{\bf{\vec E}}}_{\bf{m}}}} \right|\). With the metal block still in place, which of the arrows (a–j) in Figure 14.94 best indicates the direction of the net electric field at location A?

(d)With the metal block still in place, which of the following statements about the magnitude of \({{\bf{\vec E}}_{\bf{p}}}\), the field due only to the charged particle, is correct?

(1) \(\left| {{{{\bf{\vec E}}}_{\bf{p}}}} \right|\)is less than it was originally, because the block is in the way.

(2) \(\left| {{{{\bf{\vec E}}}_{\bf{p}}}} \right|\)is the same as it was originally, without the block.

(3) \(\left| {{{{\bf{\vec E}}}_{\bf{p}}}} \right|\)is zero, because the electric field due to the particle can’t go through the block.

(e)With the metal block still in place, how does the magnitude of\({{\bf{\vec E}}_{{\bf{net}}}}\) at location Acompare to the magnitude of \({{\bf{\vec E}}_{\bf{p}}}\)?

(f)Which of the arrows (a–j) in Figure 14.94 best indicates the direction of the net electric field at the center of the metal block (inside the metal)?

An electric field is applied to a solution containing bromide ions. As a result, the ions move through the solution with an average drift speed of 3.7×10-7m/s. The mobility of bromide ions in solution is 8.1×10-8(m/s)(N/C). What is the magnitude of the net electric field inside the solution?

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