A positively charged object with a charge of +85 nC is being used to balance the downward force of gravity on a 1.8-gram balloon that has a charge of -63 nC. How high above the balloon must the object be held in order to balance the balloon? (NOTE: 1 nC = 1 x 10-9 C)
Explanation:
force of attraction is experienced by the balloon is
F = 9 x 10⁹ (85 x 63 ) x 10^ – 18 / d²
d is the distance which is sufficient to overcome the weight experienced by
thus,
F = mass of balloon x g
( 9 x 85 x 63 ) x 10^-9 / d² = 1.8 x 10^ – 3 x 9.8
d² = ( 9 x 85 x 63 ) x 10^-6 / ( 1.8 x 9.8)
d = ( 2.7 x 10^ -3)½ m