To qualify for the postcard rate for postage, a postcard must be less than 4 1/4 inches high. Elayne has a postcard that is 4 7/8 inches high. How much is her postcard over the height limit? 1 1/2 inches
5/8 inch
2/3 inch
3/4 inch

F = 8.48 x N

Step-by-step explanation:

The force on an electron in a magnetic field can be determined by;

F = qvB Sin θ

where: e is the electron, v is its velocity, B is the measure of the magnetic field, and θ is the angle of its path.

Thus,

q = -1.6 x C

v = 106 m/s

B = 0.5 T

θ =

So that,

F = 1.6 x x 106 x 0.5

  = 8.48 x N

The force on the electron crossing the uniform magnetic field is 8.48 x N.