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Questions  

An uncharged aluminum block has a cavity within it. The block is placed in a region where a uniform electric field is directed upward. Which of the following is a correct statement describing conditions in the interior of the block's cavity?

a
The electric field in the cavity is directed upward.
b
The electric field in the cavity is directed downward.
c
There is no electric field in the cavity.
d
The electric field in the cavity is of varying magnitude and is zero at the exact center.

detailed solution

Correct option is C

Electric field is zero inside a metallic cavity if no charge is present in the cavity, whatever be the field outside.

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