In a region of space, a uniform electric field points to the left. If an uncharg

Question

In a region of space, a uniform electric field points to the left.

If an uncharged conductor is brought into this region:

a.) A small fraction of the electrons in the conductor will move  ---Select--- to the left to the right they will not move not enough info
and will induce their own electric field that points  ---Select--- to the left to the right it is zero. not enough info inside the conductor.

b.) The net electric field in this region of space will point:
everywhere inside the conductor:  ---Select--- to the left. to the right. it is zero. perpendicular to the surface of the conductor. not enough info.
everywhere just outside the conductor:  ---Select--- to the left. to the right. it is zero. perpendicular to the surface of the conductor. not enough info.
far away from the conductor:  ---Select--- to the left. to the right. it is zero. perpendicular to the surface of the conductor. not enough info.

This conductor will feel a net force due to the external electric field which is:  ---Select--- to the left to the right zero. not enough infoIf an uncharged insulator was instead brought into this same external electric field:

c.) The insulator will induce its own electric field inside itself that points  ---Select--- to the left to the right it is zero. not enough info .

d.) The net electric field inside the insulator will point  ---Select--- to the left to the right it is zero. not enough info
and will be  ---Select--- stronger than weaker than the same strength as not enough info the external electric field.

e.) Explain why conductors can do "perfect shielding" while insulators can only do "partial shielding".

Explanation / Answer

a) to the right,

to the right

b)  it is zero.

perpendicular to the surface of the conductor.

to the left.

This conductor will feel a net force due to the external electric field which is:  - zero

c) The insulator will induce its own electric field inside itself that points to the right

d) The net electric field inside the insulator will point to the left
weaker than the external electric field.

e)

A perfectly conducting enclosure that completely surrounds a given volume prevents anything within that volume from electrically coupling to anything outside that volume. This type of enclosure is called a Faraday cage. Electric fields generated within the volume either terminate on objects within the enclosure or on the inner surface of the enclosure wall . Free charge on the enclosure relocates itself as needed to exactly cancel the fields within or external to the enclosure.

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