B Electric field lines

1. Jul 30, 2017

Andy_Taiwanese

Hi, I'm reading the textbook and there is my image.
http://imgur.com/a/9BqHm

It says "The field vector E bar is tangent to the electric field line at each point".
I might want to ask what "tangent" means in this sentence? Sorry to ask that stupid question.

2. Jul 30, 2017

cnh1995

3. Jul 30, 2017

olgerm

It means any electricfield-line is parallel with electricfield vector $\vec E$ at any point.

4. Jul 30, 2017

Andy_Taiwanese

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