A solid nonconducting sphere (radius - 12 cm) has a charge of uniform
density (39 nC/m3) distributed
throughout its volume. Determine the
magnitude of the electric field 15 cm
from the center of the sphere.

The heliocentric and the geocentric models of the solar system included these central principles

Acoil suspended freely, points in some direction when no current is passed through it . can you tell what will happen when a current is passed though it?

Large electric fields in cell membranes cause ions to move through the cell wall. the field strength in a typical membrane is 1.0 x 10 7 n/c. what is the magnitude of the force on a calcium ion with charge +e? what is its acceleration? is it possible for a particle with the same charge as as calcium to have a different acceleration if placed at this location? what would change the acceleration: mass of the particle? diameter of the particle?