Why are shields made of iron usually provided around precision instruments?

For protection against the effect of moisture in the air

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For guiding the instruments against unauthorised handling

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For protection against the effect of external magnetic fields

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For absorbing heat generated during the functioning of the instruments

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Solution

The correct option is C For protection against the effect of external magnetic fields
Metals like iron can be used to shield the instruments from external magnetic fields because magnetic fields cannot penetrate metallic surfaces.

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