Charges q and Q are placed on the x axis at x = 0 and x = 2.0m, respectively. If q= -40 pC and Q =+30 pC, determine the net flux through a spherical surface (radius = 1.0 m) centered on the origin.

Explanation:

Charge q  will remain inside the given sphere and charge Q will remain outside it.

So charge inside sphere = - 40 x 10⁻¹² C

According to Gauss's law

Net flux over the spherical closed surface

= charge inside the surface / ε₀

= - 40 x 10⁻¹²  / 8.85  x 10⁻¹²

= - 4.52 Weber.

- ve sign indicates , flux is oriented towards the center.

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.

the old price per ounce is c/4.

the new price per ounce is c/3.6.

the ratio of the old price to the new one is

(c/4)/(c/3.6) = (c/c)×(3.6/4) = 0.9 . . = 9/10 . . "nine tenths" in either form