Apoint charge q is placed at the center of a conducting spherical shell (inner radius a, outer radius b). what is the electric field at a point a distance r from q? consider the cases r < a, a < r < b, and r > b.

a)

b)E=0

c)

Explanation:

Given that

A point charge Q is placed at the center of a conducting spherical shell .Due to this - Q charge will induce on the inner sphere surface and +Q will induce on the outer sphere surface .

a)    r < a

At a radius r ,from gauss theorem

b)   a < r < b

The total induce in this surface = - Q+ Q =0

E = 0

c)   r > b

explanation:

a fuel engine ( known as a gasoline engine in american english )is an internal combustion engine with spark ignition, designed to run on petrol (gasoline) and similar volatile fuels.

here we know that ball will drop down by total distance 3.2 m

so here we know that

now using kinematics

now in the same time it will cover horizontal distance of 0.75 m

so speed of the ball will be