Two large, thin, charged plastic circular plates each of radius R are placed a short distance s apart; s is much smaller than the dimensions of a plate. The right-hand plate has a positive charge of +Q evenly distributed over its inner surface (Q is a positive number). The left-hand plate has a negative charge of -2Q evenly distributed over its inner surface. A very thin plastic spherical shell of radius r is placed midway between the plates (and shown in cross section). It has a uniformly distributed positive charge of +q. You can ignore the contributions to the electric field due to the polarization of the thin plastic shell and the thin plastic plates. Charged plate I 3r B 3r 1²-1 A + +q + 1. Ia, IIc 2. Ic, IIc 3. Ib, IIa 4. Ia, IIb 5. Ic, IIb 6. Ib, IIb 7. Ib, IIc 8. Ia, Ila 9. Ic, Ila
Two large, thin, charged plastic circular plates each of radius R are placed a short distance s apart; s is much smaller than the dimensions of a plate. The right-hand plate has a positive charge of +Q evenly distributed over its inner surface (Q is a positive number). The left-hand plate has a negative charge of -2Q evenly distributed over its inner surface. A very thin plastic spherical shell of radius r is placed midway between the plates (and shown in cross section). It has a uniformly distributed positive charge of +q. You can ignore the contributions to the electric field due to the polarization of the thin plastic shell and the thin plastic plates. Charged plate I 3r B 3r 1²-1 A + +q + 1. Ia, IIc 2. Ic, IIc 3. Ib, IIa 4. Ia, IIb 5. Ic, IIb 6. Ib, IIb 7. Ib, IIc 8. Ia, Ila 9. Ic, Ila
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
Transcribed Image Text:Two large, thin, charged plastic circular
plates each of radius R are placed a short
distance s apart; s is much smaller than the
dimensions of a plate. The right-hand plate
has a positive charge of +Q evenly distributed
over its inner surface (Q is a positive number).
The left-hand plate has a negative charge of
-2Q evenly distributed over its inner surface.
A very thin plastic spherical shell of radius
r is placed midway between the plates (and
shown in cross section). It has a uniformly
distributed positive charge of +q. You can
ignore the contributions to the electric field
due to the polarization of the thin plastic
shell and the thin plastic plates.
Charged plate
3r
-20
3r
Ia) the same
Ib) smaller
Ic) larger
1²-1
A
IIa) EA > EB > Ec
IIb) EC > EB > EA
IIc) EB > EC > EA
+
+9
S<< R
Without the plastic sphere, the electric field
at A would be
+
Rank the electric field magnitudes at A,B
and C.
1. Ia, IIc
2. Ic, IIc
3. Ib, IIa
4. Ia, IIb
5. Ic, IIb
6. Ib, IIb
7. Ib, IIc
8. Ia, Ila
9. Ic, Ila
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