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It's a cathode ray tube - It's the Electrostatics chapter, passage X, Q.65 (P 149).
On occasion, the electrons are made to pass through the plates undeflected. If the electrons enter the region between the plates with the same direction, but with excessive velocity:
A) they will be deflected upward
B) they will be deflected downward
C) they will remain undeflected
D) they will be turned back the way they came.
The answer is B.
I see that the top if + and bottom is - so the electric field is going from top to bottom and since it's a negative charge then the electric force is upward. The electrons are going left to right so using the right hand rule I get that magnetic force is inward. How is it downward?
Thanks a lot!
On occasion, the electrons are made to pass through the plates undeflected. If the electrons enter the region between the plates with the same direction, but with excessive velocity:
A) they will be deflected upward
B) they will be deflected downward
C) they will remain undeflected
D) they will be turned back the way they came.
The answer is B.
I see that the top if + and bottom is - so the electric field is going from top to bottom and since it's a negative charge then the electric force is upward. The electrons are going left to right so using the right hand rule I get that magnetic force is inward. How is it downward?
Thanks a lot!
