T you have a ligure in the present problem do not use the numbers shown in the f
ID: 1401022 • Letter: T
Question
T you have a ligure in the present problem do not use the numbers shown in the figures. Please use the numbers given in the text of the problem unless you are asked to use the numbers from the figure Logout yCHIP ID is: zman. NTERACTIVE EXAMPLE Cierright, Drpartent ef Physics, Univerzity of Illinois at Urban -chempaign Coments EXT A parallel-plate capacitor in air has circular plates of radius 2.3 separated by 1.1 m Charge ts floring onto the upper plate and off the lower plate at a rate of 4 A. Find the time rate of change of the electric field between the plates. V/m per second Enter| Help | 24.1e2 24. le2 NO 1 attempt (s) made (maximum allowed for credit 5) Lafter that, multiply credit by 0 5 up to 10 attempts] Problems: 1 23 456 7 Next Previous .CHIP Error ToExplanation / Answer
a)
Spatial Length of the pulse
L=c*t =(3*108)(8*10-9)
L=2.4 m
b)
Volume
V=pi*r2*L =pi*(2*10-3)2*2.4
V=3.01*10-5 m3
Energy density With in the pulse
U=E/V =18/(3.01*10-5)
U=596.8 KJ/m3
c)
Since Energy density is given by
U=(1/2)eoEo2
Electric field of laser pulse
Eo=sqrt[2*U/eo] =sqrt[2*596.8*103/8.85*10-12]
Eo=367.25 MV/m
Magnetic field of laser pulse
Bo=Eo/c =(367.25*106)/(3*108)
Bo=1.22 T
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