Along non-conducting hollow cylinder with inner radius, ri and outer radius, r2 is charged with a uniform positive charge with a charge density ? . (a) use gauss's law in differential form for regions outside the cylinder (r > r2) to show that the electric field decreases as 1/r (note that no marks will be awarded for using gauss's law in integral form).

weight of the box is given as

here this is placed on the inclined of angle 42 degree

now this weight will have two components one is along the incline other is perpendicular to it

so here we need to apply a force parallel to incline opposite to its component of weight

so here the component of weight is given as

here we have

so it requires 75 n force to move it upwards

god i hope this !

the answer is 100. i just did this lesson and got a 100% on it. : )

-fishtank