# Electric flux through a surface

1. Mar 16, 2014

### haha1234

1. The problem statement, all variables and given/known data

Find the electric flux through the plane surface shown in the figure below if θ = 64.2°, E = 375 N/C, and d = 4.70 cm. The electric field is uniform over the entire area of the surface.

2. Relevant equations

3. The attempt at a solution

By using the equation:EAcosθ
375x0.0472cos64.2=0.167
I've found that answer is 0.167N.m2/C,but it is not correct.

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Last edited: Mar 16, 2014
2. Mar 16, 2014

### Staff: Mentor

3. Mar 16, 2014

### haha1234

I'v edited the content of my thread.Tell me of there are any things are need to be added.

4. Mar 16, 2014

### Saitama

You have done the calculations incorrectly, what did you input in your calculator?

5. Mar 16, 2014

### haha1234

375x0.0472cos64.2=0.167

6. Mar 16, 2014

### Saitama

I don't seem to be getting 0.167 with Wolfram Alpha.

7. Mar 16, 2014

### haha1234

But I cannot get he other answer.

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8. Mar 16, 2014

### Tanya Sharma

E=375
d2 = .002209
Cos64.2° = .435231

Multiply the three quantities and you should get something like .3605

9. Mar 16, 2014

### Tanya Sharma

because the tool is interpreting the angle 64.2 in radians .

10. Mar 16, 2014

### haha1234

Thanks. I finally found that I have changed the mode of my calculator into radian,so I cannot find the correct answer.