# Physics question--finding the magnitude of the electric field

by nba23
Tags: electric, field, magnitude, physics, questionfinding
 P: 1 1. The problem statement, all variables and given/known data A charged insulating ball of mass 7.0g with a uniform charge of 1.5mC hangs from a light thread inclined at an angle of 8 degrees to the vertical. Calculate the magnitude of the electric field. 2. Relevant equations q=mg/e e= Fe/q 3. The attempt at a solution I tried to use e=mg/q and i kept getting the wrong answer. Im not sure how or if i should use the given angle.Im confused because i dont know which formula i need to use for this question.
Mentor
P: 40,275
 Quote by nba23 I tried to use e=mg/q and i kept getting the wrong answer.
That would apply if the ball were suspended solely by the electric field, but its not--there's a string attached.
 Im not sure how or if i should use the given angle.Im confused because i dont know which formula i need to use for this question.
Which way does the field point? (I presume horizontally.)

What forces act on the ball? (Draw a diagram for yourself.) What must the net force be? Hint: Consider vertical and horizontal force components separately.

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