Excel in math and science.

Join using Facebook Join using Google Join using email

Forgot password? New user? Sign up

Existing user? Log in

Your answer seems reasonable. Find out if you're right!

That seems reasonable. Find out if you're right!

Join using Facebook Join using Google Join using email

Forgot password? New user? Sign up

Existing user? Log in

Electricity and Magnetism

Electric Flux

Concept Quizzes

Field lines and field strength
Electric flux
Gauss' law
Conductors
Problem solving - Flux and Gauss' law

Challenge Quizzes

Electric Flux: Level 2-3 Challenges

Problem solving - Flux and Gauss' law

Consider an infinitely long, very thin metal tube with radius $R=2.90\text{ cm}.$ The above figure shows a section of it. If the linear charge density of the cylinder is $\lambda=1.50 \times 10^{-8} \text{ C/m},$ what is the approximate magnitude of the electric field at radial distance $r=2R?$

The value of the permittivity constant is $\varepsilon_0=8.85 \times 10^{-12} \text{ C}^2\text{/N}\cdot\text{m}^2.$

1.16 \times 10^{3} \text{ N/C}

3.49 \times 10^{3} \text{ N/C}

2.33 \times 10^{2} \text{ N/C}

4.65\times10^{3}\text{ N/C}

Show explanation

View wiki

by Brilliant Staff

Consider a solid sphere of radius $a=2.30\text{ cm},$ which has a net uniform charge of $q=+4.50\text{ fC}.$ What is the approximate magnitude of the electric field at radial distances (a) $r=a/2$ and (b) $r=a ?$

The value of electrostatic constant is $\displaystyle k=\frac{1}{4\pi\varepsilon_0}=8.99 \times 10^9 \text{ N}\cdot\text{m}^2\text{/C}^2.$

\text{(a) } 1.91\times10^{-2}\text{ N/C},\text{ (b) } 0.153\text{ N/C}

\text{(a) } 3.82\times10^{-2}\text{ N/C},\text{ (b) } 0.153\text{ N/C}

\text{(a) } 3.82\times10^{-2}\text{ N/C},\text{ (b) } 0.076\text{ N/C}

\text{(a) } 1.91\times10^{-2}\text{ N/C},\text{ (b) } 0.076\text{ N/C}

Show explanation

View wiki

by Brilliant Staff

Consider a metal rod with radius of $R_1=1.20\text{ mm}$ and length $L=12.00\text{ m},$ which is inside a very thin coaxial metal cylinder with radius of $R_2=10.0 R_1$ and length $L,$ as shown in the above figure. If the net charge on the rod and on the cylinder is $Q_1=+3.40 \times 10^{-12}\text{ C}$ and $Q_2=-2.0 Q_1,$ respectively, what is the approximate magnitude of the electric field at radial distance $r=2.0 \times R_2,$ assuming that the charge density of both the rod and the cylinder are uniform?

The value of the permittivity constant is $\varepsilon_0=8.85 \times 10^{-12} \text{ C}^2\text{/N}\cdot\text{m}^2.$

0.212 \text{ N/C}

0.848 \text{ N/C}

0.424 \text{ N/C}

0.636 \text{ N/C}

Show explanation

View wiki

by Brilliant Staff

Consider a Gaussian surface in the shape of a cube with edge length $2.40\text{ m},$ as shown in the above figure. If the electric field in which the Gaussian surface lies can be expressed as $\vec{E}=(2.00x+3.00)\hat{i}+5.00\hat{j}+6.00\hat{k} \text{ (N/C)},$ where $x$ is in meters, what is the approximate net charge contained by the Gaussian surface?

The value of the permittivity constant is $\varepsilon_0=8.85 \times 10^{-12} \text{ C}^2\text{/N}\cdot\text{m}^2.$

3.00 \times 10^{-10} \text{ C}

2.45 \times 10^{-11} \text{ C}

2.45 \times 10^{-10} \text{ C}

3.00 \times 10^{-11} \text{ C}

Show explanation

View wiki

by Brilliant Staff

Consider an infinitely large non-conducting plate of thickness $d=9.20\text{ mm}.$ The above figure shows a cross section of the plate, where the origin of the $x$ -axis is at the plate's center. If the plate has a uniform charge density of $\rho=5.80\text{ fC/m}^3,$ what is the magnitude of the electric field at the $x$ -coordinate of (a) $4.60\text{ mm}$ and (b) $27.0 \text{ mm}?$

The value of the permittivity constant is $\varepsilon_0=8.85 \times 10^{-12} \text{ C}^2\text{/N}\cdot\text{m}^2.$

\text{(a) } 6.03\times10^{-6}\text{ N/C},\text{ (b) } 3.01\times10^{-6}\text{ N/C}

\text{(a) } 3.01\times10^{-6}\text{ N/C},\text{ (b) } 3.01\times10^{-6}\text{ N/C}

\text{(a) } 3.01\times10^{-6}\text{ N/C},\text{ (b) } 6.03\times10^{-6}\text{ N/C}

\text{(a) } 6.03\times10^{-6}\text{ N/C},\text{ (b) } 6.03\times10^{-6}\text{ N/C}

Show explanation

View wiki

by Brilliant Staff