In the figure, a solid sphere of the radius $a=2.00 \mathrm{cm}$ is concentric with a spherical conducting shell of inner radius $b=2.00a$ and outer radius $c=2.40a$. The sphere has a net uniform charge $q_1=+5.00 \mathrm{C}$, the shell has a net charge $q_2=-q_1$. What is the magnitude of the electric field at radial distances$r=2.30 a$?

In the figure, a solid sphere of the radius $a=2.00 \mathrm{cm}$ is concentric with a spherical conducting shell of the inner radius $b=2.00a$ and the outer radius $c=2.40a$. The sphere has a net uniform charge $q_1=+5.00 \mathrm{C}$, the shell has a net charge $q_2=-q_1$. What is the magnitude of the electric field at a radial distance $r=3.50a$?

In the figure, a solid sphere of the radius $a=2.00 \mathrm{cm}$ is concentric with a spherical conducting shell of inner radius $b=2.00a$ and outer radius $c=2.40a$. The sphere has a net uniform charge $q_1=+5.00 \mathrm{C}$, the shell has a net charge $q_2=-q_1$. What is the net charge on the inner surface of the shell?

In the figure, a solid sphere of radius $a=2.00 \mathrm{cm}$ is concentric with a spherical conducting shell of inner radius $b=2.00 a$ and outer radius $c=2.40 a$. The sphere has a net uniform charge $q_1=+5.00 \mathrm{C}$. The shell has a net charge $q_2=-q_1$. What is the magnitude of the electric field at radial distance $r=1.50 a$?

What is the net charge on the outer surface of the shell?

A uniform charge density of $500 \mathrm{nC} {\mathrm{m}}^{-3}$ is distributed throughout a spherical volume of the radius $6.00 \mathrm{cm}$. Consider a cubical Gaussian surface with its centre at the centre of the sphere. What is the electric flux through this cubical surface if its edge length is $4.00 \mathrm{cm}$?

A uniform charge density of $500 \mathrm{nC} {\mathrm{m}}^{-3}$ is distributed throughout a spherical volume of the radius $6.00 \mathrm{cm}$. Consider a cubical Gaussian surface with its centre at the centre of the sphere. What is the electric flux through this cubical surface if its edge length is $14.0 \mathrm{cm}$?

A Gaussian surface $S$ encloses two charges $q_1=q$ and $q_2=-q$. The field at $P$ is, 

where ${\overrightarrow{E}}_1$, ${\overrightarrow{E}}_2$ and $\overrightarrow{E_3}$ are the field contributed by $q_1$, $q_2$ and $q_3$ at $P$ respectively.