9. [1pt](adsbygoogle = window.adsbygoogle || []).push({});

As shown in the figure above, a ball of mass 0.480 g and positive charge q =32.7microC is suspended on a string of negligible mass in a uniform electric field. We observe that the ball hangs at an angle of theta=15.0o from the vertical. What is the magnitude of the electric field?

Fx= Fe - Tsin(theta)= 0

Fy= Tcos(theta) = 0

Tsin(theta)/Tcos(theta) = Fe\mg

Than E= Fe/q

So Tan(theta)mg = Fe/q = E

I got (Tan(15)*.480*9.8)/32.7e-6= 3.9 e 4

Where did I go wrong?

**Physics Forums | Science Articles, Homework Help, Discussion**

Join Physics Forums Today!

The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

# Finding the E-field of a mass hanging from a string

**Physics Forums | Science Articles, Homework Help, Discussion**