20
Name:______________________
Score:
Regents Physics
Worksheet 4.1.1 – Elementary Charge (20 points)
Show all work – multiple choice answers MUST be proven for full credit!
1.
An electrically neutral glass rod is rubbed against a neutral
15
piece of silk. During this process 2.0 x 10 electrons are
transferred from the rod to the silk.
a.
3.
A sphere has with a charge of +6.4 milli-coulombs is
placed on an insulating stand.
a.
How much charge (in coulombs) did the silk
acquire?
How many elementary charges does this
represent?
16
[4 x 10
-4
[-3.2 x 10 C]
b.
What charge does the glass rod have after being
rubbed on the silk?
b.
e]
Does this charged sphere have a lack of
electrons or an excess of electrons relative to
its neutral state?
[Explain]
2.
[Explain]
Determine the charge on each set of particles. Be sure to
write out your conversions (if applicable
a.
19
1.6 x 10 protons = _________________ C
4.
Sketch a graph to properly relate the number of excess
electrons contained in an object and its overall charge.
charge
b.
5
4.0 x 10 neutrons = _________________ C
number of
excess electrons
c.
24
5.3 x 10 electrons = ________________ C
5.
25
An object has an deficiency of 2.0 x 10 electrons. The
order of magnitude for the charge on this object in
coulombs is
(1) 25
(2) -19
(3) 6
Proof: Explain your reasoning/show calculations.
(4) -45
6.
Which charge could not be found on an object?
-19
(1) -0.8 x 10 C
-17
(2) -1.6 x 10 C
-19
(3) +1.6 x 10 C
-17
(4) +3.2 x 10 C
Proof: Explain your reasoning/show calculations.
7.
A charge of 100 elementary charges is equivalent to?
-21
(1) 1.60 x 10 C
-17
(2) 1.60 x 10 C
16
(3) 6.25 x 10 C
20
(4) 6.25 x 10 C
Proof: Explain your reasoning/show calculations.
8.
An object gains 10 electrons. The charge on the object is
(1) +10 e
-18
(2) +1.6 x 10 C
(3) -10 e
-20
(4) -1.6 x 10 C
Proof: Explain your reasoning/show calculations.