Answer:
Scientific models have two basic types. FALSE.
Hoped I helped
Answer:
height above the fixed charge is 8.571 cm
Explanation:
given data
mass m = 0.050 g = 5 ×
kg
charge bead q1 = 20 nC = 20 ×
C
charge base q2 = 20 nC = 20×
C
to find out
what height above the fixed charge does the bead rest
solution
we know that when charge at rest then downward gravitational force is balance by electrostatic force so
.............1
here k is 9 ×
Nm²/C² and g = 9.8 m/s² and r is height of bread
put here all value in equation 1

r² = 7.3469 × 
r = 0.08571 m = 8.571 cm
so height above the fixed charge is 8.571 cm