Physics · Oct / Nov 2016 · Paper 11 · Question 30
5054Simple magnetism and magnetic fields
Delicate instruments are often placed in a box to screen them from stray magnetic fields. What is the material used for the box and why is it chosen?
- AAluminium is used because it is a non-magnetic material.
- BCopper is used because it has a low electrical resistance.
- CPolythene is used because it is a good electrical insulator.
- DSoft iron is used because it is a magnetic material.
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Correct answer: D. Soft iron is used because it is a magnetic material.
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