In this part you have to investigate what factors affect the magnetic force appl

Question

In this part you have to investigate what factors affect the magnetic force applied to the electron beam. Set the accelerating voltage V_a = 200 V. Turn on the power supply for the coil current and slowly turn up the magnetic field coil current until I is about 1.5 A. The power supply is shows the voltage provided to the coils, but you should have a DMM set to operate as an Ammeter connected in series with the co to monitor the value of the current. Observe the path of the electron beam as you increase the current. Sketch the path. Using the equation that you derived in Part l Theory), predict whether you expect the orbit radius r to increase or decrease as the magnetic field B is increased for a fixed accelerating voltage V_a. Think how you can test this prediction, e. how can you change the magnetic field B? Perform the experiment Did r increase or decrease as field B was increased? Does it match your prediction? If not, find the reason. If instead, V_a is increased from 200 V to 250 V, does Equation (6) predict that r will increase or decrease? Using the equation that you derived in Part 1 Theory), predict whether you expect the orbit radius r to increase or decrease as the electron speed v is increased for a fixed magnetic field B (current I) Think how you can test this prediction e. how can you change speed v? Perform the experiment. Did r increase or decrease as the speed v was increased? Does it match your prediction? If not, find the reason.

Explanation / Answer

1,2 experimental observations

3. the radius of the orbit is gien by

            r = mv/Bq , v- the velcoity of the electron is a fucntion of the Voltage. As B increases we can see r decreases as it appears in the denominator.

a) By increasing the current I B will increase and r will decrease

c) if V is increased velcoity of the elcron v increases and r increases.

answer to 4 is contained in the above.

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