Qualification > Sciences
CIE physics paper 2
cs:
Nov 2002
Q6) why is the arrow in upward direction ( as what i noticed, its from higher potential to lower), any one care to explain, here's the question attached with answer
nid404:
electron has a negative charge. Direction of force on electron will be towards the positive plate.
cs:
--- Quote from: Garfield on September 14, 2010, 04:16:36 pm --- electron has a negative charge. Direction of force on electron will be towards the positive plate.
--- End quote ---
+rep
*Hope*:
Unlike charges attract and like charges repel :)
Deadly_king:
--- Quote from: cs on September 14, 2010, 11:08:42 am ---Nov 2002
Q6) why is the arrow in upward direction ( as what i noticed, its from higher potential to lower), any one care to explain, here's the question attached with answer
--- End quote ---
Actually the electric field is downwards from higher potential to lower potential. When the electron penetrates the electric field perpendicularly an electric force acts on it. This electric force is always opposite to the direction of the electric field for an electron.
Therefore the electron proceeds through the electric field between the two plates with a slight parabolic path towards the positively charged metal plate. Then it exits the field in a a straight line tangential to the point it exits the field.
But its easier to understand the way Garfield explained, i.e being negatively charge it is attracted to the positively charged metal plate.
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