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Chapter 14: Q49P (page 583)

A neutral copper block is polarized as shown in Figure 14.90, due to an electric field made by external charges (not shown). Which arrow (a鈥搄) in Figure 14.90 best indicates the direction of the net electric field at location B, which is inside the copper block ?

Short Answer

Expert verified

The arrow j best indicates the direction of the net electric field at location B, which is inside the copper block

Step by step solution

01

Significance of the electric field in the conductor

The electric field is referring to a region that is beneficial for a charged particle to exert force on another charged particle.

Also,the magnitude of the electric field is zero inside a conductor but it has some value on the surface of the conductor.

The concept of the electric field gives the direction of the net electric field at location B.

02

Determination of the direction of the net electric field

The other arrows apart from j are the incorrect representation of the direction as they are directed in the other direction with some value of magnitude. But, the magnitude of the electric field is zero inside a conductor.

When a particular conductor is placed inside an electric field, the net charges mainly lie on the conductor鈥檚 surface and thus, no electric field remains inside a conductor. However, as point B lies inside the copper block then the net electric field at point B is mainly zero and also the direction of the net electric field at point B is also zero.

Thus, the arrow j best indicates the direction of the net electric field at location B, which is inside the copper block.

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Most popular questions from this chapter

A point charge of 3脳10鈭�9鈥塁is located at the origin.

(a) What is the magnitude of the electric field at location 鉄�0.2,0,0鉄�鈥尘?

(b) Next, a short, straight, thin copper wire 3鈥尘mlong is placed along the x axis with its center at location 鉄�0.1,0,0鉄�鈥尘. What is the approximate change in the magnitude of the electric field at location 鉄�0.2,0,0鉄�鈥尘?

(c) Does the magnitude of the electric field at location 鉄�0.2,0,0鉄�鈥尘 increase or decrease as a result of placing the copper wire between this location and the point charge?

(d) Does the copper metal block the electric field contributed by the point charge?

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.

A positive charge is located between a neutral block of plastic and a neutral block of copper (Figure 14.68). Draw the approximate charge distribution for this situation.

A metal ball with diameter of a half a centimeter and hanging from an insulating thread is charged up with 1脳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鈥攖he charge on each ball is unchanged, and no other objects are around.)

A large positive charge pulls on a distant electron. How does the net force on the electron change if a slab of glass is inserted between the large positive charge and the electron? Does the net force get bigger, smaller, or stay the same? Explain, using only labeled diagrams. (Be sure to show all the forces on the electron before determining the net force on the electron, not just the force exerted by the large positive charge. Remember that the part of the net force on the electron contributed by the large positive charge does not change when the glass is inserted: the electric interaction extends through matter.)
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