Added Luis's English solution of 10.2.8

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+ <title>Savchenko Solutions</title>
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+ content="A website with solutions to physics problems from Savenko Textbook" />
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+ <header>
+ <h2>Solutions of Savchenko Physics Textbook</h2>
+ <p class="author">
+ Aliaksandr Melnichenka <br/>
+ October 2023
+ </p>
+ </header>
+
+ <main>
+ <article>
+ <h3 id="back-link"><a href="../">$\leftarrow$Back</a></h3>
+
+ <h4>Statement</h4>
+ <p>
+ $10.2.8$
+ A plane capacitor is placed in a homogeneous magnetic field od induction $B$ parallel to the plates. From point A, electrons enter perpendicularly to magnetic field direction. The tension (voltage) applied to the plates is $V$. What is the condition for which electrons pass through the capacitor?
+ </p>
+ <center>
+ <figure>
+ <img src="statement.png"
+ loading="lazy" alt="10.2.8" width="300" />
+ <figcaption>
+ For problem 10.2.8
+ </figcaption>
+ </figure>
+ </center>
+ <h4>Solution</h4>
+ <p class="TxtSolutions">
+ Electrons pass through capacitor if they don't collide with plates. So, supposing a capacitor of infinite length, electron's velocity must be parallel to the plates (or its horizontal range over a plate greater than its enter's height). This is possible if electric and magnetic forces are in equilibrium (equal absolute values and opposed directions).
+ </p>
+ <center>
+ $evB = eE$
+ </center>
+ <center>
+ $v = \frac{E}{B}$
+ </center>
+ <p calss="TxtSolutions">
+ As $E=\frac{V}{h}$,
+ </p>
+ <center>
+ $\boxed{v = \frac{V}{Bh}}$
+ </center>
+ <p class="TxtSolutions">
+ This device is known as speed's selector.
+ </p>
+ <p class="TxtSolutions" style="text-align: right; font-style: italic; font-size: 14;">
+ BSc. Luis Daniel Fernández Quintana<br>
+ Physics Department (FCNE)<br>
+ Universidad de Oriente, Cuba<br>
+ </p>
+ </article>
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