Physics · Para-, dia- and ferromagnetic substances with examples, the effect of temperature on magnetic properties
Assertion (A): To protect any instrument from external magnetic field, it is put
Assertion (A): To protect any instrument from external magnetic field, it is put inside an iron box Reason (R) : Iron is a ferromagnetic substance
- A. Both A and R are true and R is the correct explanation of A
- B. Both A and R are true and R is not correct explanation of
- C. A is true, but R is false
- D. A is false, but R is true
Step-by-step solution
Iron is ferromagnetic with high magnetic permeability, so it provides a low-reluctance path for magnetic field lines, effectively shielding the interior from external fields. Thus, using an iron box protects instruments, and the reason correctly explains the assertion.
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