Parallel-plate capacitors: Each plate of a parallel-plate ai…

Parallel-plate capacitors: Each plate of a parallel-plate air-filled capacitor has an area of  0.0020 m2, and the separation of the plates is 0.020 mm An electric field of 3.9 x 106 V/m is present between the plates. What is the surface charge density on the plates? (

Ohm’s law: A cylindrical wire of radius  2.0 mm carries a cu…

Ohm’s law: A cylindrical wire of radius  2.0 mm carries a current of  2.5 A. The potential difference between points on the wire that are  46 m apart is  3.7 V.(a) What is the electric field in the wire?  (2 points)(b) What is the resistivity of the material of which the wire is made? (2 points)