Calculating the Electric FLux

  • #1
arileah
8
2
Hello,

The problem:

A 3.60cm x 4.50cm rectangle lies in the xy-plane. What is the electric flux through the rectangle if E=(80.0i + 50k) N/C ?

My attempt:

First convert the rectangle units from cm to m.

4.50cm = 0.045m
3.60cm = 0.036m

Find the area of the rectangle.

A = 0.036m x 0.045m = 0.00162 m^2

Find the magnitude of the electric field.

E = sqrt (50^2 + 80^2) = 94.34 N?C (aprox.)

Multiply the two,

electric flux = E * A = 0.15283 Nm^2 / C (aprox.)

However, this answer is wrong. Could anyone point me in the right direction? Thank you.
 

Answers and Replies

  • #2
BvU
Science Advisor
Homework Helper
15,268
4,244
Hello arileah, :welcome:

This looks like homework and should be posted in the homework forum -- there's a mandatory template there.
Your error is at the point where you multiply the two: that is a vector multiplication, not a magnitude multiplication.
 
  • #3
arileah
8
2
Hello arileah, :welcome:

This looks like homework and should be posted in the homework forum -- there's a mandatory template there.
Your error is at the point where you multiply the two: that is a vector multiplication, not a magnitude multiplication.

Thank you! I am new to using physics forums. I'll post it to the homework forum.
 

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