Easy
Assertion $(A)$: Electromagnets are made of soft iron.
Reason $(R)$: Coercivity is small for soft iron.
Reason $(R)$: Coercivity is small for soft iron.
- ABoth $(A)$ and $(R)$ are true and $(R)$ is the correct explanation of $(A)$
- BBoth $(A)$ and $(R)$ are true and $(R)$ is not the correct explanation of $(A)$
- C$(A)$ is true,but $(R)$ is not true
- D$(A)$ is not true,but $(R)$ is true
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Statement $II :$ At high temperature,the domain wall area of a ferromagnetic substance increases.
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