Electric Force Textbook error?

[quicksilver123]

Homework Statement

Find the net force given a point charge and the value of the electric field.

Homework Equations

F_E = εq

ε= (5.6*10^4)
q=(-1.2 * 10^-5)

The Attempt at a Solution

F_E = εq
F_E = (5.6*10^4)(-1.2 * 10^-5)
F_E = 0.672 N

Seriously. I am posting this question.

Here's the answer the book gave:

F_E = εq
F_E = (5.6*10^4)(-1.2 * 10^-5)
F_E = (6.7*10^4) N

It does this again on the answer to the next question, increasing the magnitude by 10^5.

Everything I know tells me I'm right but I need to be sure I'm not doing something very wrong. I don't know why this text is still in circulation if its riddled with this many errors.​

 

[gneill]

Did the question supply units to associate with the field and charge values?

 

[quicksilver123]

xxxx

 

[quicksilver123]

charge is in coulombs

field is in Newtons per coulomb

 

[quicksilver123]

xxxx

 

[gneill]

So, coulombs for charge, meters for distances. Looks like your answer is correct and the text is in error.

 

[quicksilver123]

Thanks.

Kind of frustrating, seeing as how we're expected to learn the course solely from the text... which is very inaccurate a lot of the time.

 

[Hakkinen]

What is the text, Halliday and Resnick?

 

[quicksilver123]

Nah. This place makes their own text for Canadian students.