Show work. 3. Interrupting a straight wire is a parallel capacitor with circular

Question

Show work. 3. Interrupting a straight wire is a parallel capacitor with circular plates of radius R l = 16.00 em is being charged as shown. The point labeled .0 A. the electric field E inside the capacitor is s inside the capacitor, atr= 9.00 cm. I straight wire carries a constant current 20 "I.. increasing at a constant rate of (q/A)/(Ed)=1/(nRao) = 2.81 x 1013 (N/C)/s. (a) Calculate the magnitude of the magnetic (b) Just outside the capacitor, what is the field at point 1 i2) magnetic field at r = 9.00 cm away from the straight wire?

Explanation / Answer

a) at r = 9 cm < R (inside the capacitor)

B = mue*epsilon*A*dE/dt

= 4*pi*10^-7*8.854*10^-12*pi*0.09^2*2.81*10^13

= 7.96*10^-6 T

b) at r < R
B = mue*I*r/(2*pi*R^2)

= 4*pi*10^-7*20*0.09/(2*pi*0.16^2)

= 1.41*10^-5 T

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