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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.

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