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The electric field between the plates of a parallel-plate capacitor is horizontal, uniform and has a magnitude E. A small object with a charge of -2.50 µC is attached to the string. Assume that the tension in the string is 0.350 N, and the angle it makes with the vertical is 15°.

(a) What is the mass of the object?

(b) What is the magnitude of the electric field?

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