Where did the charge go?

St. Mary's Physics YouTube Channel

School blocks YouTube? Use the file below.

Where_did_the_charge_go_.mp4

 

 

 

 

 

The charge went into the glass.

See Leyden Jar at Wikipedia

 

 

 

E) Elementary Charge - smallest charge known to exist in nature

 


Charges come in whole number multiples of

1.6 x 10
-19 Coulombs

 

p  

+1.6 x 10-19 C

(Reference)


e-

-1.6 x 10-19 C



(Reference)

 

 

Ex) Object has 4 p, 1 e-, charge?

 

 

 

+ 3 elem. charges or ...

 

 

+ 4.8 x 10-19 C

 

Ex) How many excess charges are there in an object with a charge of -9.6 x 10–19 C?

 

 

 

 

6 excess electrons

 

 

 


Divide by
1.6 X 10
-19
Coulombs

To find # of

elementary charges

 

 

Ex) A metal sphere -1.1 × 10-6 C. How many more electrons than protons are on the sphere?

 

a) 1.8 × 1012 b) 5.7 × 1012
c) 6.9 × 1012 d) 9.9 × 1012

 

Ratio

 

1 elementary charge

1.6 X 10-19 coulombs

 

 

Divide by 1.6 × 10-19 C

 

 

 

Scientific Notation/TI83Plus


 

-1.1 × 10-6 C

(1.6 × 10-19 C)

 

 

c) 6.9 × 1012 electrons

 

 

 

 

Ex) An object can  have a charge of

a) 3.2 x 10-19 C b) 4.5 x 10-19 C
c) 8.0 x 10-19 C d) 9.6 x 10-19 C

 

 

 

 

 

b) 4.5 x 10-19 C not possible


(not an even multiple
of 1.6 x 10-19
C)

 

 

 

 

 

 

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