Figure shows a plastic rod with a uniform charge -Q. It is bent in a 120° circular arc of radius r and symmetrically placed across an x axis with the origin at the center of curvature P of the rod. In terms of Q and r, what is the electric field E due to the rod at point P? Plastic rod of charge -Q 60° 60°

Please answer f only

Consider a conductor plate carrying a current I as shown in the figure. Current flows in the negative direction. It is also known that a conductor has a charge-carrying density of n with 1 particle carrying a charge q . This conductor plate is then placed on the a region with an external magnetic B field in the z direction . Determine the potential difference across the conductors! State the answer in terms of B, n, q, I, B, and d! (Assume positive charge carrier) *This potential, which is often referred to as the Hall potential V_H, is commonly measured in experiments to determine the properties of a material. However, there are other quantities that are also measured namely the Hall coefficient R_H. In ordinary metals, the relationship between R_H and V_H is as following (equation in figure)

Problem Description Two small metal spheres A and B have different electric potentials. Sphere A has charge qA = -6x10-6 C and sphere B has charge qB = +2x10-6 C. The radius of sphere A is 0.25 m and the radius of sphere B is 0.50 m. The two spheres are then connected with a wire. Instructions In a neat and organized fashion, write out a solution which includes the following: A sketch of the physical situation with all given physical quantities clearly labeled. If the description above consists of an initial and final state, both of these states should be represented in your sketch. Draw charge diagrams of the spheres before and after they are connected. Charges may be drawn directly on your sketches. Describe in words and mathematically what happens if you connect the spheres with a wire. Calculate the final charge on each sphere after they are connected. What assumptions did you make? Evaluate your answer to determine whether it is reasonable or not. Consider all aspects of your…

A 0.5 mm air gap has cross sectional area of 7 cm². In order to generate a total flux of 50 microweb in the air gap, the mmf required is?