A spherical capacitor of inner radius 1.00 mm and outer radius 2.00 mm has the electric energy density of 2.00 x 10 En at r= 1.50 mm. What is the magnitude of the electric field at region r? A. 2.00 x 106 V/m B. 4.00 x 106 V/m C. 2.00 x 1012 V/m D. 4.00 x 1012 V/m

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A. spherical capacitor of inner radius 1.00 mm and outer radius 2.00 mm has the electric energy density of 2.00 x
at r= 1.50 mm. What is the magnitude of the electric field at region r?
A. 2.00 x 106 V/m
B. 4.00 x 10° V/m
C. 2.00 x 1012 V/m
D. 4.00 x 102 V/m
A parallel plate capacitor is connected to an ideal battery with voltage V. While the battery is stil connected, a slab with
dielectric constant K is inserted between the plates. Which of the following is TRUE regarding the electric field E and the stored
energy U?
A. E increases, U increases
B. E decreases, U decreases
C. E remains the same, U increases
D. Eremains the same, U remains the same
2
Given a cylindrical conductor of radius 1.50 mm with current density 2.50 A/m and free-electron density of
3
8.00 x 1028
What is the drift speed?
А. 1.95 х 10 10 m/s
18
B. 1.95 x 10 m/s
C. 2.76 x 10 m/s.
D. 2.76 x 10 1 m/s
Transcribed Image Text:A. spherical capacitor of inner radius 1.00 mm and outer radius 2.00 mm has the electric energy density of 2.00 x at r= 1.50 mm. What is the magnitude of the electric field at region r? A. 2.00 x 106 V/m B. 4.00 x 10° V/m C. 2.00 x 1012 V/m D. 4.00 x 102 V/m A parallel plate capacitor is connected to an ideal battery with voltage V. While the battery is stil connected, a slab with dielectric constant K is inserted between the plates. Which of the following is TRUE regarding the electric field E and the stored energy U? A. E increases, U increases B. E decreases, U decreases C. E remains the same, U increases D. Eremains the same, U remains the same 2 Given a cylindrical conductor of radius 1.50 mm with current density 2.50 A/m and free-electron density of 3 8.00 x 1028 What is the drift speed? А. 1.95 х 10 10 m/s 18 B. 1.95 x 10 m/s C. 2.76 x 10 m/s. D. 2.76 x 10 1 m/s
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