A Ping-Pong Ball Covered with a Conducting Graphite Coating Has

Multiple Choice

A ping-pong ball covered with a conducting graphite coating has a mass of 5.4 × 10−³ kg and a charge of 3.8 µC.What electric field directed upward will exactly balance the weight of the ball? (g = 9.8 m/s²) ​

A) 7.2E+1 N/C
B) 1.4E+4 N/C
C) 6.3E-8 N/C
D) 2.1E+6 N/C
E) 6.9E+6 N/C