3. Figure 2 shows part of a system used to eject and accelerate electrons. B-field into hot filament anode X x x X page -path of electrons x x * downward E-field path and direction of electrons 2000 V Figure 3 Figure 2 (a) State the phenomenon of emission of electrons from a sufficiently heated metal surface. (b) Determine the speed with which the electrons leave the anode. (e) Upon leaving the anode, the electrons enter into a region of cross magnetic and electric fields as shown in figure 3. If the intensity of the electric field is 7.5x10* V m', calculate the flux density of the magnetic field if the electrons pass through the cross fields undeflected as shown in figure 3.

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Units and Dimensions

These are generally defined as the terms which precede or describes the dimensions further. These are also further divided into two parts namely fundamental units and the derived units.