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The square and circle in FIGURE Q24.3 are in the same uniform field. The diameter of the circle equals the edge length of the square. Is Φsquarelarger than, smaller than, or equal to Φcircle? Explain.

Short Answer

Expert verified

The electric flux through the square is larger than the electric flux through the square.

Step by step solution

01

Given information and formula used  

Given :

The square and circle are in the same uniform field.

The diameter of the circle = the edge length of the square.

Theory used :

The amount of electric field that travels through a closed surface is referred to as the electric flux.

The electric field through a surface is related to the charge inside the surface, according to Gauss's law. When the electric field is homogeneous, we compute the electric flow using equation :

ϕe=E→·A→

02

Determining if Φsquare larger than, smaller than, or equal to Φcircle

The diameter of a circle is L, which is the same as the length of the square. The circle's area is:

A→circle=π(L2)2=0.785L2 ; so

ϕcircle=E(0.785L2)=0.785EL2

is the electric field through the circle.

Now, the square's area is :

Asquare=L×L=L2.

And the electric field through the square is :

role="math" localid="1649315945211" ϕsquare=E(L2)=EL2

The electric flux through the square is larger than the electric flux through the square, as evidenced by the data.

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Most popular questions from this chapter

What is the net electric flux through the cylinder of FIGURE?

All examples of Gauss's law have used highly symmetric surfaces where the flux integral is either zero or EA. Yet we've claimed that the net Φe=Qin/ϵ0is independent of the surface. This is worth checking. FIGURE CP24.57 shows a cube of edge length Lcentered on a long thin wire with linear charge density λ. The flux through one face of the cube is not simply EA because, in this case, the electric field varies in both strength and direction. But you can calculate the flux by actually doing the flux integral.

a. Consider the face parallel to the yz-plane. Define area dA→as a strip of width dyand height Lwith the vector pointing in the x-direction. One such strip is located at position localid="1648838849592" y. Use the known electric field of a wire to calculate the electric flux localid="1648838912266" dΦthrough this little area. Your expression should be written in terms of y, which is a variable, and various constants. It should not explicitly contain any angles.

b. Now integrate dΦto find the total flux through this face.

c. Finally, show that the net flux through the cube is Φe=Qin/ϵ0.

What is the electric flux through the surface shown in FIGURE EX24.9?

A 20-cmradius ball is uniformly charged to80nC.

a. What is the ball's volume charge density (C/m3)localid="1648741376835" ?

b. How much charge is enclosed by spheres of radiilocalid="1648741380973" 5,localid="1648741279896" 10andlocalid="1648741787973" 20cmlocalid="1648741405448" ?

c. What is the electric field strength at points localid="1648741424743" 5,localid="1648741429590" 10andlocalid="1648741433205" 20localid="1648741437392" cmfrom the centerlocalid="1648741447708" ?

55.3million excess electrons are inside a closed surface. What is the net electric flux through the surface?

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