6/ If the electric field at a certain point is zero, does that mean the electric
ID: 2066313 • Letter: 6
Question
6/ If the electric field at a certain point is zero, does that mean the electric potential at that point is also zero?
a- Yes.
b- No.
7/ A cylindrical wire has a resistance,R. If its length and diameter are BOTH doubled. What will be its resistance?
a- 4R
b- 2R
c- R
d- R/2
e- R/4
8/ A cylindrical wire has a resistivity,p. If its length and diameter are BOTH doubled. What will be its resistivity?
a- 4p
b- 2p
c- p
d- p/2
e- p/4
9/ When a current flows in a metal wire ( Hint: What types of charges are free to move in metals?)
a- protons are moving in the direction of the current.
b- protons are moving opposite of the current.
c- electrons are moving in the direction of the current.
d- both protons and electrons are moving in the direction of the current.
10/ Wire A carrier 7 A into a juction, Wire B carrier 3 A into the same junction, and another wire is conected to the junction. What is that current in this wire?
a- 4 A away from the junction
b- 4 A into the junction
c- 10 A into the junction
d- 10 A away from the junction
Explanation / Answer
Number 6)
The answer is Yes
Number 7)
The answer is d
Number 8)
The answer is c
Number 9)
Only electrons are free to move in a wire, so c has a potential answer, but electrons flow in the opposite direction of the current. Is there a choice e, or did you mistype c. (If its all ok, I guess your book wants the answer of c since electrons are the elements traveling)
Number 10)
The answer is d
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