**. A long, cylindrical wire has the cross-section of an annulus, i.e. region between two concentric circles, see the shaded area in figure a). The outer radius of the wire is 2R, the inner diameter is R. Current I flows along the wire (perpendicularly into the page) in uniform distribution between radii R and 2R. a) b) xI R XI R 2R 2R a) Find and plot the magnitude of the magnetic field as a function of distance r from the symmetry axis of the wire.

The figure below is a cross-sectional view of a coaxial cable. The center conductor is surrounded by a rubber layer, an outer conductor, and another rubber layer. In a particular application, the current in the inner conductor is I, = 1.16 A out of the page and the current in the outer conductor is I, = 2.90 A into the page. Assuming the distance d = 1.00 mm, answer the following. d d (a) Determine the magnitude and direction of the magnetic field at point a. magnitude HT direction -Select--- (b) Determine the magnitude and direction of the magnetic field at point b. magnitude UT direction ---Select---

1) A 5.50 m length of 1.9 mm -diameter wire carries a 780 mA current when 23.0 mV is applied to its ends. The drift velocity is 1.2×10−5 m/s Part D Determine the electric field inside the wire. Express your answer to two significant figures and include the appropriate units. Part E Determine the number n of free electrons per unit volume. Express your answer using two significant figures.

6a: Please help answer this ASAP