1.

Suppose that a parallel-plate capacitor has circular plates with radius R = 24 mm and a plate separation of 4.5 mm. Suppose also that a sinusoidal potential difference with a maximum value of 180 V and a frequency of 49 Hz is applied across the plates; that is, V = (180 V) sin[27r(49 Hz)t]. Find BmaX(R), the maximum value of the induced magnetic eld that occurs at r = R. A parallel-plate capacitor with circular plates of radius 70 mm is being discharged by a current of 3.5 A. At what radius (a) inside and (b) outside the capacitor gap is the magnitude of the induced magnetic eld equal to 75% of its maximum value? (c) What is that maximum value? Uniform displacementcurrent density. The gure shows a circular region of radius R = 3.00 cm in which a displacement current is directed out of the page.The displacement current has a uniform density of magnitude Jd = 3.90 A/m2. What is the magnitude of the magnetic eld due to the displacement current at radial distances (a) 2.00 cm and (b) 6.00 cm