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24.7 cm long string in a uniform electric field

of 3980 N/C, as shown.The acceleration of gravity is 9.8 m/s2 , and

the Coulomb constant is 8.99×109 N · m2/C2..

If the ball is in equilibrium when the string

makes a 27.6◦ angle with the vertical as indi-

cated, what is the net charge on the ball?

Answer in units of μC.

This is how i did it.

q= m*g*tanz/e

q= 24.7e-3 * 9.81*tan 24.7 / 3980

q= 31.79545474

Please tell me what is wrong or if i am using the wrong formula