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Two small spheres each of mass m are suspended by light strings of light L. A uniform electric field is applied in the x direction. If the spheres have equal and opposite charges of magnitude Q, determine the electric field intensity that enables the spheres to be in equillibrium at angle theta. Express your answers in terms of m, L, Q, theta, g and k.

------------ this is the diagram .

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/ | \

/ | \

O O ****edit: for some reason the diagram is not

(-) (+) aligned properly when i submit the post

from the diagram I came up with two equations.

Felec + Tcos theta - Fexternal = 0

Tsing theta - mg = 0

Felec = kQ1Q2 / r^2

i don't know what L is for since i don't have it in my equations.

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# Homework Help: Finding electric field intensity of two spheres

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