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Cathode-ray tubes (CRTs) are often found in oscilloscopes and computer monitors


Cathode-ray tubes (CRTs) are often found in oscilloscopes and computer monitors. In the figure (Figure 1)an electron with an initial speed of 6.30x106 m/s is projected along the axis midway between the deflection plates of a cathode-ray tube. The potential difference between the two plates is 18.0 V and the lower plate is the one at higher potential. 

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Part A 

What is the magnitude of the force on the electron when it is between the plates? 

Part B 

What is the direction of the force on the electron when it is between the plates? 

  • Upward 

  • Downward 

Part C 

What is the magnitude of the acceleration of the electron when acted on by the force in part (a)?

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Answer #1

Concept: first we find out the electric field using the voltage and distance between plates, and then we use field to find the force and then we use Newton's law of motion to find the acceleration of the electron,

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