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 2.5 × 10−³ kg and a charge of 4.0 µC.What electric field directed upward will exactly balance the weight of the ball? (g = 9.8 m/s²)

A) 6.1 × 10³ N/C
B) 2.0 × 10−⁷ N/C
C) 5.1 × 10⁶ N/C
D) 1.2 × 10⁴ N/C