A Vertical Infinite Nonconducting Plane Has Uniform Positive Charge

A vertical, infinite, nonconducting plane has uniform positive charge. A weightless thread is attached to the plane, and at the end of the thread there is a small spherical ball with a charge of +78.6 μC, and a mass of 0.954 kg. The angle that the thread makes with the plane is 37.3°. What is the charge density σ of the plane?

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