Energy density in an electric field

A magnetic field has a magnitude of 12 T. What is the magnitude of an electric field that stores the same energy per unit volume as this magnetic field?

Hi. Can someone please explain to me what exactly the electric potential is and how it differs from electric potential energy -- not with equations, but in prose. (Or at least, with both.) I can read the equation, but I don't really understand what electric potential IS. What is its significance? Thank you!

Problem 1 A charge is moved from one place to another in an electric field. In which of the following situations will the change in potential energy be NON-ZERO? the charge is only moved perpendicular to all electric field lines that it crosses the charge remains unmoved the charge is moved along an equipotential surfa

Please help with the following problems. 1. In the figure, two charges q1=+3.0uC and q2=-2.0uC are separated by 6.0cm. a. Find the electric forces exerted on each other (magnitude and direction) b. Find the electric field from point P, which id 4.0cm to the right q2 (megnitude and direction). c. Find the positions along t

A square with sides of 2m has a line charge density of 3 uC/m throughout its four sides. It is inside a square with a line charge density of -2 uC/m, such that the two squares share the same center. This outer square has sides of 4m. What is the electric field at the center of the set up? Please give a step by step solution,

Does the electric field always move from positive to negative? If I'm told that a uniform electric field of magnitude 4.1 x 10^5 N/C points in the positive x direction, and a 4.5 micro-C charge moves 6.0 m in the positive x direction, and to find the electric potential energy (which is -11 J), does my equation look like this:

Four quick conceptual questions: 1) Is the electric field (E = -delta V / delta s) always a positive number (or zero)? That is, is it always the absolute value of the magnitude of the electric field? Or can it have a negative value? 2) Is electric potential (delta V) always negative? The answer to one of the questions in m

Find the energy stored in the electrostatic field of a uniformly charged (with density p) spherical shell of inner radius a and outer radius b. Sphere of what Radius R in space contains half of that energy?

1. Two spherical drops of mercury each have a charge of 0.1 nC and a potential of 300v at the surface. The two drops merge to form a single drop. What is the potential at the surface of the new drop? 2. A long thin straight wire with linear charge density (lambda) runs down the center of a thin, hollow metal cylinder of radiu