Problem #3 (40 Points)
A small block of mass
m
and charge
Q
is placed on an insulated, frictionless, inclined
plane of angle
u
as in figure below. An electric field is applied parallel to the incline. (a)
Find an expression for the magnitude of the electric field that enables the block to
remain at rest. ( 20 points) (b) If
m=5.40g,Q=9.00\mu C
, and
\theta =35.0\deg
, determine the
magnitude and the direction of the electric field that enables the block to remain at rest
on the incline. ( 20 points)