Homework Help: physics

Posted by Anonymous on Tuesday, November 6, 2012 at 5:26pm.

A small sphere of charge q = +68 ƒÝC and mass m = 5.8 g is attached to a light
string and placed in a uniform electric field E that makes an angle ƒá = 37„a with the horizontal. The opposite
end of the string is attached to a wall and the sphere is in static equilibrium when the string is horizontal as
in Figure P15.22.
(a) Construct a free body diagram for the sphere.
(b) Find the magnitude of the electric field.
(c) Find the tension in the string.

physics - Elena, Tuesday, November 6, 2012 at 6:12pm
vector T +vector mg +vector F(el) =0
x: -T+F(el)cos37 =0
y: Fsin37 –mg =0
F(el) =qE
q•E•cos37 = T
q•E •sin37 =mg
tan37 =mg/T
T=mg/tan37= ...
E=T/q•cos37=...

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