Explanation Given: The gravitational acceleration is, g = 9.8 m / s 2 . The net charge is, q = 1.6 × 10 − 19 C . The mass of the drops is, m = 1.0 × 10 − 15 kg . Formula used: The electric field is given by, m drop g = q E Calculation: The electric field is calculated as, m drop g = q E ( 1.0 × 10 − 15 kg ) ( 9.8 m / s 2 ) = ( 1.6 × 10 − 19 C ) E E = ( 1

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