Electric charges, wrong answer D: ?

In summary: OIn summary, a net force is being found at point A using two charges, q1 and q2, located 3m north and 3m east of A respectively. The attempt at a solution involves calculating the electric field at point A without a charge, using the formula Fe=qE. However, there is a discrepancy between the calculated answer and the answer given in the book, leading to uncertainty about the accuracy of the data provided.
  • #1
Eats Dirt
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Homework Statement



Find the net force at point A

q1=-6x10^-5 C
q2=-3x10^-5 C

q1 is 3m north of A
q2 is 3m east of A



find the net force on a -1.2x10^-5 C charge

The Attempt at a Solution



first off I find how the electric field is with no charge at point A

= 6.7 x 10^4 N/C [E 63 degrees N]

= Fe= qE
Fe= (-1.2x10^-5)(6.7x10^4)
Fe= 0.804 [W 63 degrees S]

However the answer in the book says the answer is 8x10^4 N [W63degreesS]

i don't know if it is me or the book making the mistake?
 
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  • #2
Eats Dirt said:

Homework Statement



Find the net force at point A

q1=-6x10^-5 C
q2=-3x10^-5 C

q1 is 3m north of A
q2 is 3m east of A
find the net force on a -1.2x10^-5 C charge

The Attempt at a Solution



first off I find how the electric field is with no charge at point A

= 6.7 x 10^4 N/C [E 63 degrees N]

= Fe= qE
Fe= (-1.2x10^-5)(6.7x10^4)
Fe= 0.804 [W 63 degrees S]

However the answer in the book says the answer is 8x10^4 N [W63degreesS]

i don't know if it is me or the book making the mistake?

Read carefully to make sure the distances really are 3m. That is a long way away.
Your calculation look OK to me, given the figures you have provided here. But to 3 figures that should be 0.805 [0.804984]
Given that some of the data was given to only 1 significant figure - you answer should have been 0.8

Peter
 
Last edited:

What is an electric charge?

An electric charge is a fundamental property of matter that causes it to experience electromagnetic interactions with other charged particles.

What are the two types of electric charges?

The two types of electric charges are positive and negative. Positive charges are carried by protons, while negative charges are carried by electrons.

What is the SI unit of electric charge?

The SI unit of electric charge is the coulomb (C), named after French physicist Charles-Augustin de Coulomb.

Can electric charges be created or destroyed?

No, electric charges cannot be created or destroyed. They can only be transferred from one object to another.

How do electric charges interact with each other?

Electric charges can attract or repel each other based on their polarity. Like charges (positive-positive or negative-negative) repel each other, while opposite charges (positive-negative) attract each other.

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