Problem 1: UP 6.46 A total charge Q is distributed uniformly throughout a spherical shell of inner and outer radii ₁ and 12, respectively. Show that the electric field due to the charge is r≤r₁ 1₁ ≤r ≤r₂ 0, Q E(r)=4neor²r²³ - r³, 1 Q 4περ 12 Î, f, r≥ 12

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**Problem 1: UP 6.46**

A total charge \( Q \) is distributed uniformly throughout a spherical shell with inner and outer radii \( r_1 \) and \( r_2 \), respectively. Show that the electric field due to the charge is 

\[
\mathbf{E}(r) = 
\begin{cases} 
0, & r \leq r_1 \\ 
\frac{Q}{4 \pi \varepsilon_0 r^2} \left( \frac{r^3 - r_1^3}{r_2^3 - r_1^3} \right) \hat{r}, & r_1 \leq r \leq r_2 \\ 
\frac{1}{4 \pi \varepsilon_0 r^2} \, Q \, \hat{r}, & r \geq r_2 
\end{cases}
\]

In this expression:

- \( \varepsilon_0 \) represents the permittivity of free space.
- \( \hat{r} \) denotes the radial unit vector.

The piecewise function describes the electric field \( \mathbf{E}(r) \) in three regions:
1. Inside the inner radius \( r_1 \), where no electric field exists.
2. Between radii \( r_1 \) and \( r_2 \), where the electric field depends on the position \( r \) and the distribution of charge.
3. Outside the outer radius \( r_2 \), where the field behaves as if all the charge \( Q \) were concentrated at the center.

This setup is a classic example of applying Gauss's law to spherically symmetric charge distributions.
Transcribed Image Text:**Problem 1: UP 6.46** A total charge \( Q \) is distributed uniformly throughout a spherical shell with inner and outer radii \( r_1 \) and \( r_2 \), respectively. Show that the electric field due to the charge is \[ \mathbf{E}(r) = \begin{cases} 0, & r \leq r_1 \\ \frac{Q}{4 \pi \varepsilon_0 r^2} \left( \frac{r^3 - r_1^3}{r_2^3 - r_1^3} \right) \hat{r}, & r_1 \leq r \leq r_2 \\ \frac{1}{4 \pi \varepsilon_0 r^2} \, Q \, \hat{r}, & r \geq r_2 \end{cases} \] In this expression: - \( \varepsilon_0 \) represents the permittivity of free space. - \( \hat{r} \) denotes the radial unit vector. The piecewise function describes the electric field \( \mathbf{E}(r) \) in three regions: 1. Inside the inner radius \( r_1 \), where no electric field exists. 2. Between radii \( r_1 \) and \( r_2 \), where the electric field depends on the position \( r \) and the distribution of charge. 3. Outside the outer radius \( r_2 \), where the field behaves as if all the charge \( Q \) were concentrated at the center. This setup is a classic example of applying Gauss's law to spherically symmetric charge distributions.
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