(A) : A metallic shield in the form of a hollow shell may be built to block an electric field.
(R) : In a hollow spherical shield, the electric field inside it is zero at every point.

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Both ‘A’ and ‘R’ are true and ‘R’ is the correct explanation of ‘A’.

‘A’ is false and ‘R’ is false

Both ‘A’ and ‘R’ are true and ‘R’ is not the correct explanation of ‘A’

‘A’ is true and ‘R’ is false

answer is A.

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Detailed Solution

Metals have huge number of conducting electrons which aligned themselves in such a way that the combination of the negative charge and the positive charge gives the net electric charge equal to zero. As a result, at any point inside the cavity the electric field is zero. Hence, the metallic field in the form of the hollow shell is built to block an electric field.

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