Two 40-g spheres are suspended by 90-cm-long light strings, Ask an Expert

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Two 4.0-g spheres are suspended by 9.0-cm-long light strings (see the figure). A uniform electric field is applied in the x-direction. If the spheres have charges of ?6. 10-8 C and +6. 10-8 C, determine the electric field intensity that enables the spheres to be in equilibrium at ? = 12°.

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