Asphere with radius r is centered at the origin, an infinite cylinder with radius r has it axis along the z-axis, and an infinite slab with thickness 2r lies between the planes z=âr and z=r. the uniform charge volume densities of these objects are ïsph, ïcyl, and ïslab respectively. the objects are superposed on top of each other; the densities add where the objects overlap. how should the three densities be related so that the electric field is zero everywhere throughout the volume of the sphere?

and are tangents to circle O at B and A. We can conclude that, for circle O,  and are equal complementary supplementary , and and are equal complementary supplementary .

a solenoid is created by wrapping a l = 90 m long wire around a hollow tube of diameter d = 4.5 cm.   the wire diameter is d = 0.9 mm.   the solenoid wire is then connected to a power supply so that a current of i = 9 a flows through the wire.

randomized variablesl = 90 m

d = 4.5 cm

d = 0.9 mm

i = 9 a                                          

write an expression for the number of turns, n, in the solenoid. you do not need to take into account the diameter of the wire in this calculation.

calculate the number of turns, n, in the solenoid.

write an expression for the length of the solenoid (l2) in terms of the diameter of the hollow tube d.

calculate the length of the solenoid (l2)   in meters.

calculate the magnitude of the magnetic field at the center of the solenoid in teslas.

explanation:

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