[3pts] The schematic below shows the position of a particle with electric charge Q and the electric field it causes at different distances in the points A, B, and C. Q EQ ÉQ B Is Q positive or negative? How can you tell? [6pts] Now let's assume that points A and B lie inside an electrically insulating block of plastic. Plastic Insulator Q tc In points A and B, add one arrow each to indicate the induced dipole moment of a local molecule. [9pts] In point C of the figure from part 2 (above), add and label 3 arrows indicating (i) the electric field EQ from the charged particle, (ii) the field Epal due to the polarization of the plastic, and (iii) the net field Ent [12pts] Finally, consider the situation where points A and B lie inside a metal block. Metal Q Indicate in both points (i) the field Eo from the charged particle, (ii) the field Epol due to mobile charges in the metal, and (iii) the net field Et in this point. Check that the relative lengths of these arrows make sense. B

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[3pts] The schematic below shows the position of a particle with electric charge Q and the electric field it
causes at different distances in the points A, B, and C.
Q
EQ
ÉQ
B
Is Q positive or negative? How can you tell?
[6pts]
Now let's assume that points A and B lie inside an electrically insulating block of plastic.
Plastic Insulator
Q
tc
In points A and B, add one arrow each to indicate the induced dipole moment of a local molecule.
[9pts]
In point C of the figure from part 2 (above), add and label 3 arrows indicating
(i) the electric field EQ from the charged particle,
(ii) the field Epal due to the polarization of the plastic, and
(iii) the net field Ent
[12pts]
Finally, consider the situation where points A and B lie inside a metal block.
Metal
Q
Indicate in both points
(i) the field Eo from the charged particle,
(ii) the field Epol due to mobile charges in the metal, and
(iii) the net field Et in this point.
Check that the relative lengths of these arrows make sense.
B
Transcribed Image Text:[3pts] The schematic below shows the position of a particle with electric charge Q and the electric field it causes at different distances in the points A, B, and C. Q EQ ÉQ B Is Q positive or negative? How can you tell? [6pts] Now let's assume that points A and B lie inside an electrically insulating block of plastic. Plastic Insulator Q tc In points A and B, add one arrow each to indicate the induced dipole moment of a local molecule. [9pts] In point C of the figure from part 2 (above), add and label 3 arrows indicating (i) the electric field EQ from the charged particle, (ii) the field Epal due to the polarization of the plastic, and (iii) the net field Ent [12pts] Finally, consider the situation where points A and B lie inside a metal block. Metal Q Indicate in both points (i) the field Eo from the charged particle, (ii) the field Epol due to mobile charges in the metal, and (iii) the net field Et in this point. Check that the relative lengths of these arrows make sense. B
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