An object of mass m = 2.9 g and charge q = +42 µc is attached to a string and placed in a uniform electric field that is inclined at an angle of 30.0° with the horizontal. the object is in static equilibrium when the string is horizontal.
a) find the magnitude of the electric field. b) find the tension in the string. i know a is -mg + sin 30 * qe =0 but i don't know how to solve for it

(a) 
F= qE 

F sin 30.0° = mg 
= 0.0026(10) 
= 0.026 N 
F = 0.052 N 

E = F/q = 0.052 / 60µ = 867 N/C 

(b) 
T = F cos 30.0° 
= 0.0450 N

Hey there!

No, that would be a biologist. Biologists study biology, or life. They're focused on life cycles, cells, evolution, and so much more.

Physicists focus on physics. They learn about forces, motion, and the study of the universal forces like gravity, momentum, and speed. Just like mathematics, they study patterns and look for new discoveries to be found in the fields of science, physics, and even mathematics.

Hope this helps!