MULTIPLE CHOICE 1.) Why can you shield an object from an external electric field

Question

MULTIPLE CHOICE

1.) Why can you shield an object from an external electric field using a conductor?

(a) There are freely moving electric charges inside conductors.

(b) There are positive and negative charges inside conductors.

(c) Both a and b are essential.

2.) Two identical positive charges are located at a distance d form each other. Where are both the E field and the electric potential zero?

(a) exactly between the charges

(b) at a distance d from both charges

(c) Both a and b are correct

(d) None of these choices is correct.

Explanation / Answer

1(a) because in a field F= qE, the free charge experiences force, so it will start to move, until it balance E and create E' locally to make total E=0 so F= qE=0

2) d) because no point at finite distance, potential is 0.

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