Acharge q= 2 c is distributed uniformly through out a bar of length l=2.5 m. the bar is placed horizontally in free space. a second charge q = 10−9c is placed along the line of the bar a distance d= 2m away in space, measured from the right end of the bar. what force is exerted on charge q by the charged bar?

F = 2 N

Explanation:

Let the rod is made up of large number of point charges

so here force due to one small part which is at distance "x" from the end of the rod on the given charge is

here we know that

so we have

now plug in all data

a.metals can become magnetic if they have many spinning electrons that create magnetic fields.d.only some metals are attracted by magnets; these metals are called ferromagnetic.

d.wrapping an insulated wire around a metal with ferromagnetic properties and applying an electric current.

magnified images possible images can be real = projected onto a screen