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Criticize the following statement: "Since an atom's electron cloud is spherical, the effect of the electrons cancels the effect of the nucleus, so a neutral atom can't interact with a charged object." ("Criticize" means to explain why the given statement is inadequate or incorrect, as well as to correct it.)

Short Answer

Expert verified

Electrons do not move inside a circular path.

Step by step solution

01

Significance of Maxwell’s electromagnetism equation

Maxwell’s electromagnetic equation has four equations that are Gauss’ electric fields law, the formula of the magnetic field, Faraday’s magnetic induction law, and Ampere’s current displacement.

02

Criticizing the given statement

Electrons do not move inside a circular path. However, the movement of the electrons in a circular orbit was explained in quantum physics. Also, due to gravity, a negatively charged electron moves around a nucleus having positively charged particles such as protons. Maxwell's electromagnetism equation, while in a classical motion, is described as an electric current, which would create a magnetic field emitted by the electron moving in spherical or circular orbits. However,it would lose its energy and fall on the nucleus in no time. Hence, this has not been observed to occur like this.

As there is electron movement, hence, the movement is not a trajectorial classical movement. However, in quantum physics, it makes sense while considering the probabilities to find the electrons at different angles and distances from the nucleus. Moreover, the probability distributions mainly depend on the quantum numbers, angular momentum, and energy level eventually giving a better approximation.

Thus, Electrons do not move inside a circular path.

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Most popular questions from this chapter

The mobility of the mobile electrons in copper is4.5×10-3(m/s)/(N/C). How large an electric field would be required to give the mobile electrons in a block of copper a drift speed of 1×10-3m/s?

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?

Metal sphere A is charged negatively and then brought near an uncharged metal sphere B (Figure 14.78). Both spheres rest on insulating supports, and the humidity is very low.

(a) Use +’s and −’s to show the approximate distribution of charges on the two spheres. (Hint: Think hard about both spheres, not just B.)

(b) A small, lightweight hollow metal ball, initially uncharged, is suspended from a string and hung between the two spheres (Figure 14.79). It is observed that the ball swings rapidly back and forth hitting one sphere and then the other. This goes on for seconds, but then the ball stops swinging and hangs between the two spheres. Explain in detail, step by step, why the ball swings back and forth and why it finally stops swinging. Your explanation must include good physics diagrams.

The diagrams in Figure 14.98 show a sequence of events involving a small lightweight aluminum ball that is suspended from a cotton thread. In order to get enough information, you will need to read through the entire sequence of events described below before beginning to answer the questions. Before trying to select answers, you will need to draw your own diagrams showing the charge state of each object in each situation. (a) A small, lightweight aluminum ball hangs from a cotton thread. You touch the ball briefly with your fingers, then release it (Diagram 1 in Figure 14.98). Which of the diagrams in Figure 14.99 best shows the distribution of charge in and/or on the ball at this moment, using the diagrammatic conventions discussed in this chapter? (b) A block of metal that is known to be charged is now moved near the ball (Diagram 2 in Figure 14.98). The ball starts to swing toward the block of metal, as shown in Diagram 3 in Figure 14.98. Remember to read through the whole sequence before answering this question: Which of the diagrams in Figure 14.99 best shows the distribution of charge in and/or on the ball at this moment? (c) The ball briefly touches the charged metal block (Diagram 4 in Figure 14.98). Then the ball swings away from the block and hangs motionless at an angle, as shown in Diagram 5 in Figure 14.98. Which of the diagrams in Figure 14.99 best shows the distribution of charge in and/or on the ball at this moment? (d) Finally, the block is moved far away. A negatively charged rod is brought near the ball. The ball is repelled by the charged rod, as shown in Diagram 6 in Figure 14.98. Which of the diagrams in Figure 14.99 best shows the distribution of charge in and/or on the ball at this moment?

A metal ball with diameter of a half a centimeter and hanging from an insulating thread is charged up with 1×1010excess electrons. An initially uncharged identical metal ball hanging from an insulating thread is brought in contact with the first ball, then moved away, and they hang so that the distance between their centers is 20cm.

(a) Calculate the electric force one ball exerts on the other, and state whether it is attractive or repulsive. If you have to make any simplifying assumptions, state them explicitly and justify them.

(b) Now the balls are moved so that as they hang, the distance between their centers is only 5cm. Naively one would expect the force that one ball exerts on the other to increase by a factor of 42=16, but in real life the increase is a bit less than a factor of role="math" localid="1661330186132" 16. Explain why, including a diagram. (Nothing but the distance between centers is changed—the charge on each ball is unchanged, and no other objects are around.)

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