Electric Dipole Moment question

AI Thread Summary
The problem involves calculating the magnitude of an electric field acting on a dipole formed by point charges of +4.70 and -4.70 separated by 3.90 mm, with a torque of 7.00×10−9 Nm. The relevant equation for torque is τ = d(sinθ)qE, and the user initially misapplied the angle in their calculations. The correct angle to use is 37 degrees, leading to the correct electric field magnitude of 634.6 N/C when properly substituted into the equation. The discussion highlights the importance of using the correct angle in physics calculations to avoid errors. Accurate application of formulas is crucial for obtaining the right results in electric dipole problems.
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Homework Statement


Point charges +4.70 and -4.70 are separated by distance 3.90mm, forming an electric dipole.
The charges are in a uniform electric field whose direction makes an angle 37.0 degrees with the line connecting the charges. What is the magnitude of this field if the torque exerted on the dipole has magnitude 7.00×10−9 Nm ?

Homework Equations


τ=d(sinθ)qE
E=τ/(sinθ)dq

The Attempt at a Solution


(7E-9) / sin(30)(.0039)(4.7E-9)

763.78 N/C

What am I doing wrong?
 
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Is the angle 30 or 37 degrees?

ehild
 
37, thank you
I was getting so frustrated, stupid error
For anyone else who reads this thread you should get 634.6N/C when you plug in sin(37) into the equation above
 

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