Instrument can be shielded from outside magnetic effects by surrounding them with

Rubber shield

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Glass shield

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Iron shield

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Brass shield

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Solution

The correct option is C Iron shield
Using Ampere's law, we can calculate the magnetic field inside a metallic shield (iron). Which turns out to be zero. So instrument can be shielded from outside magnetic effects by surrounding them with iron shield.

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A sensitive magnetic instrument can be shielded very effectively from outside magnetic fields by placing it inside a box of:

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