Physics

Problem

There must be Homogenously concentrated fixed singly ionized (+ve) ions having concentration 'n' within a parallel homogenous electron beam of a circular cross section having concentration '

n_0

' so that radius of the beam remains constant if the beam moves with constant velocity

v

along its axis. Find

\left(\frac{n}{n_0}\right)

? (A)

1 - \frac{v^2}{c^2}

(B)

1 + \frac{v^2}{c^2}

(C)

\frac{v^2}{c^2}

(D)

\frac{c^2}{v^2}

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