Q. Assertion : A metallic shield in the form of a hollow shell may be build to block an electric field.
Reason : In a hollow spherical shield, the electric field inside it is zero at every point.

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Solution:

In a hollow spherical shield, the charge is present only on its surface but charge is zero at every point inside the hollow sphere. Hence, the metallic shield in the form of hollow shell may be bulk to block an electric field.