Two large, parallel conducting plates are separated by a dis…

Two large, parallel conducting plates are separated by a distance of d=2 mmd = 2 \, \text{mm}. Each plate has an area of A=0.02 m2A = 0.02 \, \text{m}^2. The region between the plates is filled with a material with dielectric constant [x]. Find the capacitance (in , one decimal place) of the capacitor.

Two infinitely long parallel wires carry currents of equal m…

Two infinitely long parallel wires carry currents of equal magnitude. What is the resultant magnetic field due to the two wires at a point midway between the wires—compared with the magnetic field due to one of them alone—if the currents are in opposite directions? (Choose all the correct answers).