Posted by Josh on .
A 3.5uC charge experiences a 13 ihatN electric force in a certain electric field.What force would a proton experience in the same field?
I got 7.28*10^18
from (1.6*10^19)(45.5)
I got 45.5 from multiplying 13 by 3.5
What am I doing wrong?

Physics 
bobpursley,
I would have just done a proportion:
Force= 13N*(3.5E6/1.6E19)= I don't get your answer. 
Physics 
Josh,
I got 2.84E14 plugged it in and got the wrong answer

Physics 
bobpursley,
change the proportion to
13N(1.6E19/3.5E6)
check that thinking. 
Physics 
ozzy,
ok both ways were wrong, you use cross multiplication: 1.6E19/F x 3.5E6/13N
F(on proton)= (13N *1.6E19)/ 3.5E6