PHYSICS 1250 Lecture Notes - Lecture 12: Institution Of Engineering And Technology

Guys... I do not know why my answer is wrong.
the question is The maximum electric field 10.2 m from an isotropicpoint source of light is 1.9 V/m.
1) What is the maximum value of the magnetic field at thisdistance?
I got a 6*10^-9

I used this equation like bm=Em/c= 1.9v/m ./ 3.0*10^8= 6*10^-9 or0.00000006
I put both answer on the webassign, but my answer is stillwrong.
Has anybody helped me out?

Two cylindrical glass beads each of mass m = 12.3 mg are set ontheir flat ends on a horizontal insulating surface separated by adistance d = 1.53 cm. The coefficient of static friction betweenthe beads and the surface is ms = 0.201. The beads are then givenidentical charges (magnitude and sign). What is the minimum chargeneeded to start the beads moving?

Two cylindrical glass beads each of mass m = 13.1 mg are set on their flat ends on a horizontal insulating surface separated by a distance d = 3.05 cm. The coefficient of static friction between the beads and the surface is ms = 0.197. The beads are then given identical charges (magnitude and sign). What is the minimum charge needed to start the beads moving?