![Page 1: A spherical Gaussian surface (#1) encloses and is centered ...plam/ph272_summer/L2/22_ClickerQuestions_Lam.pdfA spherical Gaussian surface (#1) encloses and is centered on a point](https://reader030.vdocuments.mx/reader030/viewer/2022040921/5e9a51d62952bf29b37a31db/html5/thumbnails/1.jpg)
A spherical Gaussian surface (#1)encloses and is centered on a pointcharge +q. A second sphericalGaussian surface (#2) of the samesize also encloses the charge but isnot centered on it.
Compared to the electric fluxthrough surface #1, the flux throughsurface #2 is
A. greater. B. the same.
C. less, but not zero. D. zero.
E. not enough information given todecide
Q22.1
+q
Gaussiansurface #1
Gaussiansurface #2
![Page 2: A spherical Gaussian surface (#1) encloses and is centered ...plam/ph272_summer/L2/22_ClickerQuestions_Lam.pdfA spherical Gaussian surface (#1) encloses and is centered on a point](https://reader030.vdocuments.mx/reader030/viewer/2022040921/5e9a51d62952bf29b37a31db/html5/thumbnails/2.jpg)
A spherical Gaussian surface (#1)encloses and is centered on a pointcharge +q. A second sphericalGaussian surface (#2) of the samesize also encloses the charge but isnot centered on it.
Compared to the electric fluxthrough surface #1, the flux throughsurface #2 is
A. greater. B. the same.
C. less, but not zero. D. zero.
E. not enough information given todecide
A22.1
+q
Gaussiansurface #1
Gaussiansurface #2
![Page 3: A spherical Gaussian surface (#1) encloses and is centered ...plam/ph272_summer/L2/22_ClickerQuestions_Lam.pdfA spherical Gaussian surface (#1) encloses and is centered on a point](https://reader030.vdocuments.mx/reader030/viewer/2022040921/5e9a51d62952bf29b37a31db/html5/thumbnails/3.jpg)
Two point charges,+q (in red) and –q(in blue), arearranged as shown.
Through whichclosed surface(s) isthe net electric fluxequal to zero?
A. surface A only B. surface B only
C. surface C only C. surface D only
D. both surface C and surface D
Q22.2
![Page 4: A spherical Gaussian surface (#1) encloses and is centered ...plam/ph272_summer/L2/22_ClickerQuestions_Lam.pdfA spherical Gaussian surface (#1) encloses and is centered on a point](https://reader030.vdocuments.mx/reader030/viewer/2022040921/5e9a51d62952bf29b37a31db/html5/thumbnails/4.jpg)
Two point charges,+q (in red) and –q(in blue), arearranged as shown.
Through whichclosed surface(s) isthe net electric fluxequal to zero?
A. surface A only B. surface B only
C. surface C only C. surface D only
D. both surface C and surface D
A22.2
![Page 5: A spherical Gaussian surface (#1) encloses and is centered ...plam/ph272_summer/L2/22_ClickerQuestions_Lam.pdfA spherical Gaussian surface (#1) encloses and is centered on a point](https://reader030.vdocuments.mx/reader030/viewer/2022040921/5e9a51d62952bf29b37a31db/html5/thumbnails/5.jpg)
A conducting spherical shell with innerradius a and outer radius b has apositive point charge Q located at itscenter. The total charge on the shell is–3Q, and it is insulated from itssurroundings. In the region a < r < b,
A. the electric field points radially outward.
B. the electric field points radially inward.
C. is zero.
D. not enough information given to decide
Q22.3
![Page 6: A spherical Gaussian surface (#1) encloses and is centered ...plam/ph272_summer/L2/22_ClickerQuestions_Lam.pdfA spherical Gaussian surface (#1) encloses and is centered on a point](https://reader030.vdocuments.mx/reader030/viewer/2022040921/5e9a51d62952bf29b37a31db/html5/thumbnails/6.jpg)
A conducting spherical shell with innerradius a and outer radius b has apositive point charge Q located at itscenter. The total charge on the shell is–3Q, and it is insulated from itssurroundings. In the region a < r < b,
A. the electric field points radially outward.
B. the electric field points radially inward.
C. is zero.
D. not enough information given to decide
A22.3
![Page 7: A spherical Gaussian surface (#1) encloses and is centered ...plam/ph272_summer/L2/22_ClickerQuestions_Lam.pdfA spherical Gaussian surface (#1) encloses and is centered on a point](https://reader030.vdocuments.mx/reader030/viewer/2022040921/5e9a51d62952bf29b37a31db/html5/thumbnails/7.jpg)
A conducting spherical shell with innerradius a and outer radius b has apositive point charge Q located at itscenter. The total charge on the shell is–3Q, and it is insulated from itssurroundings. How much charge residesin the inner surface (r=a)?
A. zero.
B. -1.5 Q .
C. - Q.
D. not enough information given to decide
Q22.4
![Page 8: A spherical Gaussian surface (#1) encloses and is centered ...plam/ph272_summer/L2/22_ClickerQuestions_Lam.pdfA spherical Gaussian surface (#1) encloses and is centered on a point](https://reader030.vdocuments.mx/reader030/viewer/2022040921/5e9a51d62952bf29b37a31db/html5/thumbnails/8.jpg)
A conducting spherical shell with innerradius a and outer radius b has apositive point charge Q located at itscenter. The total charge on the shell is–3Q, and it is insulated from itssurroundings. How much charge residesin the inner surface (r=a)?
A. zero.
B. -1.5 Q .
C. - Q.
D. not enough information given to decide
A22.4
![Page 9: A spherical Gaussian surface (#1) encloses and is centered ...plam/ph272_summer/L2/22_ClickerQuestions_Lam.pdfA spherical Gaussian surface (#1) encloses and is centered on a point](https://reader030.vdocuments.mx/reader030/viewer/2022040921/5e9a51d62952bf29b37a31db/html5/thumbnails/9.jpg)
A conducting spherical shell with innerradius a and outer radius b has a positivepoint charge Q located at its center. Thetotal charge on the shell is –3Q, and it isinsulated from its surroundings. What isthe force on a test charge (q) locatedoutside the shell at the distance r fromthe center (r > b) ?
A. zero.
B. kqQ/r2, pointing outward
C. kq(3Q)/r2 , pointing inward
D. kq(2Q)/r2 , pointing inward
Q22.5
![Page 10: A spherical Gaussian surface (#1) encloses and is centered ...plam/ph272_summer/L2/22_ClickerQuestions_Lam.pdfA spherical Gaussian surface (#1) encloses and is centered on a point](https://reader030.vdocuments.mx/reader030/viewer/2022040921/5e9a51d62952bf29b37a31db/html5/thumbnails/10.jpg)
A conducting spherical shell with innerradius a and outer radius b has a positivepoint charge Q located at its center. Thetotal charge on the shell is –3Q, and it isinsulated from its surroundings. What isthe force on a test charge (q) locatedoutside the shell at the distance r fromthe center (r > b) ?
A. zero.
B. kqQ/r2, pointing outward
C. kq(3Q)/r2 , pointing inward
D. kq(2Q)/r2 , pointing inward
A22.5
![Page 11: A spherical Gaussian surface (#1) encloses and is centered ...plam/ph272_summer/L2/22_ClickerQuestions_Lam.pdfA spherical Gaussian surface (#1) encloses and is centered on a point](https://reader030.vdocuments.mx/reader030/viewer/2022040921/5e9a51d62952bf29b37a31db/html5/thumbnails/11.jpg)
A conducting spherical shell with innerradius a and outer radius b has a positivepoint charge Q located at off-center. Thetotal charge on the shell is –3Q, and it isinsulated from its surroundings. What isthe force on a test charge (q) locatedoutside the shell at the distance r fromthe center (r > b) ?
A. Not enough information to decide
B. kqQ/r2, pointing outward
C. kq(3Q)/r2 , pointing inward
D. kq(2Q)/r2 , pointing inward
Q22.6
![Page 12: A spherical Gaussian surface (#1) encloses and is centered ...plam/ph272_summer/L2/22_ClickerQuestions_Lam.pdfA spherical Gaussian surface (#1) encloses and is centered on a point](https://reader030.vdocuments.mx/reader030/viewer/2022040921/5e9a51d62952bf29b37a31db/html5/thumbnails/12.jpg)
A conducting spherical shell with innerradius a and outer radius b has a positivepoint charge Q located at off-center. Thetotal charge on the shell is –3Q, and it isinsulated from its surroundings. What isthe force on a test charge (q) locatedoutside the shell at the distance r fromthe center (r > b) ?
A. Not enough information to decide
B. kqQ/r2, pointing outward
C. kq(3Q)/r2 , pointing inward
D. kq(2Q)/r2 , pointing inward
A22.6
![Page 13: A spherical Gaussian surface (#1) encloses and is centered ...plam/ph272_summer/L2/22_ClickerQuestions_Lam.pdfA spherical Gaussian surface (#1) encloses and is centered on a point](https://reader030.vdocuments.mx/reader030/viewer/2022040921/5e9a51d62952bf29b37a31db/html5/thumbnails/13.jpg)
For which of the following charge distributions wouldGauss’s law not be useful for calculating the electric field?
A. a uniformly charged sphere of radius R
B. a spherical shell of radius R with charge uniformlydistributed over its surface
C. a circular cylinder of radius R and height h withcharge uniformly distributed over its surface
D. an infinitely long circular cylinder of radius R withcharge uniformly distributed over its surface
E. Gauss’s law would be useful for finding the electricfield in all of these cases.
Q22.7
![Page 14: A spherical Gaussian surface (#1) encloses and is centered ...plam/ph272_summer/L2/22_ClickerQuestions_Lam.pdfA spherical Gaussian surface (#1) encloses and is centered on a point](https://reader030.vdocuments.mx/reader030/viewer/2022040921/5e9a51d62952bf29b37a31db/html5/thumbnails/14.jpg)
For which of the following charge distributions wouldGauss’s law not be useful for calculating the electric field?
A. a uniformly charged sphere of radius R
B. a spherical shell of radius R with charge uniformlydistributed over its surface
C. a circular cylinder of radius R and height h withcharge uniformly distributed over its surface
D. an infinitely long circular cylinder of radius R withcharge uniformly distributed over its surface
E. Gauss’s law would be useful for finding the electricfield in all of these cases.
A22.7