Question: Electronic devices are usually enclosed in metal boxes. One function of the box is to shield the inside components from external electric fields. (a) How

Electronic devices are usually enclosed in metal boxes. One function of the box is to shield the inside components from external electric fields.
(a) How does this shielding work?
(b) Why is the degree of shielding better for constant or slowly varying fields than for rapidly varying fields?
(c) Explain the reasons why it is not possible to shield something from gravitational fields in a similar way.

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