Hysteresis loops for two magnetic materials A and B are given below:
These materials are used to make magnets for electric generators, transformer core and electromagnet core. Then it is proper to use :
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Hysteresis loops show magnetic material behavior. A narrow loop (Material B) has low coercivity and retentivity, meaning it magnetizes and demagnetizes easily, ideal for AC applications like transformers and electromagnets to minimize energy loss. A wide loop (Material A) has high coercivity, retaining magnetism, suitable for permanent magnets in electric generators.
Final answer: A for electric generators and B for transformers and electromagnets. However, based on options, the closest match is "B for electromagnets and transformers."