Criticize the following statement: “A positive charge attracts neutral plastic by polarizing the molecules and then attracting the negative side of the molecules.” (“Criticize” means to explain why the given statement is inadequate or incorrect, as well as to correct it.)

Short Answer

Expert verified

The positive and negative charged molecules are attracted by the neutral plastic.

Step by step solution

01

Significance of the polarization of molecules

Polarization of molecules occurs when the electric field deforms the cloud of the negatively charged electron around a positively charged nucleus in the opposite direction to the electric field.

02

Explanation of given statement

Interconnection between two like charges (positive-positive) is repulsive, whereas the interconnection between opposite charges (negative-positive) is attractive. In the case of a neutral object, any charge, whether positive or negative, always has attractive interconnection with a neutral object.

A positively charged particle does not attract the plastic molecules. Instead, the positive charge creates the plastic molecules due to the action of the electric field. However, the plastics mainly behave like a dipole and are attracted to the positive charge that exerts an attractive force.

Thus, the positive charge and negative charge of the molecule attract the neutral plastic by polarizing the molecules.

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Most popular questions from this chapter

A small glass ball is rubbed all over with a small silk cloth and acquires a charge of +5nC. The silk cloth and the glass ball are placed 30 cm apart.

(a) On a diagram like that shown in Figure 14.71, draw the electric field vectors qualitatively at the locations marked ×. Pay careful attention to directions and to relative magnitudes. Use dashed lines to explain your reasoning graphically, and draw the final electric field vectors with solid lines.

(b) Next, a neutral block of copper is placed between the silk and the glass.

On a diagram like that shown in Figure 14.72, carefully show the approximate charge distribution for the copper block and the electric field vectors inside the copper at the locations marked ×.

(c) The copper block is replaced by a neutral block of plastic. Carefully show the approximate molecular polarization of the plastic block at the locations marked × in Figure 14.73.

(d) Even if you have to state your result as an inequality, make as quantitative a statement as you can about the electric field at the location of the glass ball and the net force on the ball when the plastic block is in place compared to when there is no block. Explain briefly.

Which of the following are true? Select all that apply. (1) In equilibrium, there is no net flow of mobile charged particles inside a conductor. (2) The electric field from an external charge cannot penetrate to the center of a block of iron. (3) The net electric field inside a block of aluminum is zero under all circumstances. (4) If the net electric field at a particular location inside a piece of metal is not zero, the metal is not in equilibrium. (5) The net electric field at any location inside a block of copper is zero if the copper block is in equilibrium.

A student said, “When you touch a charged piece of metal, the metal is no longer charged: all the charge on the metal is neutralized.” As a practical matter, this is nearly correct, but it Isn’t exactly right. What’s wrong with saying that all the charge on the metal is neutralized?

If the distance between a neutral atom and a point charge is tripled, by what factor does the force on the atom by the point charge change? Express your answer as a ratio: new force/original force.

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.

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