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

Question

Quizplus · Accepted Answer

To balance the weight of the ball, the electric force (F_e) must equal the gravitational force (F_g). The gravitational force is given by F_g = m*g, where m is the mass and g is the acceleration due to gravity. The electric force is given by F_e = q*E, where q is the charge and E is the electric field. Setting F_g = F_e gives m*g = q*E. Solving for E gives E = (m*g)/q. Substituting the given values (m = 5.4 × 10^-3 kg, g = 9.8 m/s^2, q = 3.8 × 10^-6 C) yields E ≈ 1.4 × 10^4 N/C.

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