Hysteresis loops for two magnetic materials $A$ and $B$ are given below. These materials are used to make magnets for electric generators,transformer cores,and electromagnet cores. Then it is proper to use:
- A$A$ for transformers and $B$ for electric generators.
- B$B$ for electromagnets and transformers.
- C$A$ for electric generators and transformers.
- D$A$ for electromagnets and $B$ for electric generators.
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