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pokeefer

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## Homework Statement

I'm currently doing Physics 12.

Its about electric fields, voltage, current, power, gravitation field and series, parallel and series-parallel circuits.

I've already taken the test once and got 48% because I didn't fully study the last section which involved series-parallel circuits.

Anyway its a total of 70 marks

34 marks Multiple choice (I got them all correct)

14 marks Series-parallel circuits calculations of voltage, current, resistance (I got none right)

22 marks about a cathode ray tube and deflection (I got none right)

So as you can see it seems like the last section of the course was the most important one.

## The Attempt at a Solution

The multiple choice was completely understand and all correct. When I got to the series-parallel circuit questions I didn't know what to do because I didn't study that section yet and so lost 14 marks for nothing.

Next is the last part of the test worth 22 marks which I flunked completely and need your advice about:

A cathode ray tube with a voltage Va shoots itself in between two metal plates. The voltage between the plates is Vb. In front of the two metal plates is a screen. Its asking about deflection.

First there was a graph of Voltage versus deflection graph. Voltage on y-axis and deflection on x-axis

1.) Find the slope of the line. I didn't know where to start.

2.) What is the relationship between voltage and deflection?

3.) What is the deflection on the screen?

Those are the only questions I can remember but there is a lot more and I worded them to my memory.

Can anyone give any advice or references to a voltage versus deflection graph? It was Va and D.