First of all, thanks for your great efforts

I wish you answer my question quickly, because i have an exam this week,

1-Give reasons for :
- The surface of a conductor must be an equipotential surface
- The decrease of resistivity of a conductor by increasing ite temperature

2-what do you understand by Ohm law ???

3-Distinguish by equetions among:
-The (emf) & the source of (emf).

4-Drive an expression describe the electric field due to a charged infinite surface charge distribution .
(((does it mean that i have to drive an expression for the electric field due to very large non conducting plate ?????))))))

Thank you very much

These questions need a substantial narrative for an answer.

See this link below for this sites approach to homework

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I suggest you hit the books and get studying.

Thank you for replying ,

but really, these questions are not my homework .
they came in past exams in our faculty and i could not answer them

I do not want from you ,sir a complete answer,
i just want the idea of each of them.

And really thanks very much for helping and for your advice.