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Simple Electric Circuit

A slightly di...

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A slightly divergent beam of charged particles accelerated by a potential difference v propagates from a point a along the axis of a solenoid.the beam is brought into focus at a distance l from the point a at two successive values of magnetic induction b1 and b2.find the specific charge q/m of the particles.

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Q. Electrons emitted with negligible speed from an electron gun are accelerated through a potential difference

V_{0}

along the x-axis. These electrons emerge from a narrow hole into a uniform magnetic field of strength

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axis, some electrons emerging at slightly divergent angles as shown in the figure. These paraxial electrons are refocused on the x-axis at a distance (Given charge of electron

= e

, mass of electron

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(e, m)

emitted with negligible speed from an electron gun are accelerated through a potential difference

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x-

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x-

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\sqrt{\frac{N π^{2} m V_{0}}{e B^{2}}}

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