Question

Cell phones use an electric field to receive and broadcast signals. A salesman claims that carrying the phone in a pouch constructed of metalized fabric will protect cell phone user’s privacy. Which of the following correctly assesses the statement and provides evidence to support the claim?

A The claim is correct, because any fabric would block the signal from the antenna as long as the antenna is completely inside it.

B: The claim is correct, because the field cannot pass through the fabric since all charge resides on the outside of a conductor.

C: The claim is incorrect, because the fabric is not solid and cannot fully block the signal.

D: The claim is incorrect, because the fabric actually helps the field get to the phone, since a conductor will focus the signal.

E: It depends on what type of metal is used. A copper pouch would work, but an aluminum one would not.

Answer 1

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