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two identical small spheres of mass 2.0 g are fastened to the ends of a 0.60 m long light, flexible, insultation fishling. The fishline is suspended by a hook in the ceiling at its exact centre. The spheres are each given an identifical electric charge. They are in static equilibrium, whith an angle of 30 degrees between the string halves and the "horizon." Calculate the magnitude of the charges of each spehere.

what i've done:

i calculated the y force necessary for each charge and i got 0.196 N. therefore i got the x charges to be 0.339 N. the distance between the two speheres is trig'd 0.5196 m. because it's in static equilibrium i figured the x charges must equal the force between the two speheres. after subbing my force into the "f=k2(q)/r^2" equation i got q to equal 5.085x10^12.

but i don't think i've got it right. can someone verify please?

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# Homework Help: Electric forces/static equilibrium doozy

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