Assume that a honeybee is a sphere of diameter 1.000 cm with a charge of +49.0 pC uniformly spread over its surface. Assume also that a spherical pollen grain of diameter 44.0 µm is electrically held on the surface of the sphere because the bee's charge induces a charge of -1.00 pC on the near side of the sphere and a charge of +1.00 pC on the far side.
(a) What is the magnitude of the net electrostatic force on the grain due to the bee?
N
(b) Next, assume that the bee brings the grain to a distance of 1.000 mm from the tip of a flower's stigma and that the tip is a particle of charge -39.5 pC. What is the magnitude of the net electrostatic force on the grain due to the stigma?
N