The sure test of magnetism refers to a method or phenomenon that can definitively confirm the presence of magnetism in an object. Among the options provided:

A. **Rotation**: While rotating magnetized materials can produce electromagnetic effects, it is not a definitive test for magnetism itself.

B. **Attraction**: This refers to the ability of a magnet to attract ferromagnetic materials. This characteristic is widely used as a test for magnetism because if a material is attracted to a magnet, it is magnetized.

C. **Repulsion**: This refers to the observation that like poles of magnets repel each other. This phenomenon can also confirm that two like poles are indeed magnets.

D. **None of the above**: This option implies that none of the previously mentioned effects can be a sure test of magnetism.

Among all the options, **B. Attraction** is the most appropriate answer since attraction to ferromagnetic materials is a clear and definitive characteristic of magnetism.

### Final Answer
**B. Attraction**

Question

The sure test of magnetism refers to a method or phenomenon that can definitively confirm the presence of magnetism in an object. Among the options provided:

A. **Rotation**: While rotating magnetized materials can produce electromagnetic effects, it is not a definitive test for magnetism itself.

B. **Attraction**: This refers to the ability of a magnet to attract ferromagnetic materials. This characteristic is widely used as a test for magnetism because if a material is attracted to a magnet, it is magnetized.

C. **Repulsion**: This refers to the observation that like poles of magnets repel each other. This phenomenon can also confirm that two like poles are indeed magnets.

D. **None of the above**: This option implies that none of the previously mentioned effects can be a sure test of magnetism.

Among all the options, **B. Attraction** is the most appropriate answer since attraction to ferromagnetic materials is a clear and definitive characteristic of magnetism.

### Final Answer
**B. Attraction**

Knowee AI · Accepted Answer

The sure test of magnetism refers to a method or phenomenon that can definitively confirm the presence of magnetism in an object. Among the options provided:

A. **Rotation**: While rotating magnetized materials can produce electromagnetic effects, it is not a definitive test for magnetism itself.

B. **Attraction**: This refers to the ability of a magnet to attract ferromagnetic materials. This characteristic is widely used as a test for magnetism because if a material is attracted to a magnet, it is magnetized.

C. **Repulsion**: This refers to the observation that like poles of magnets repel each other. This phenomenon can also confirm that two like poles are indeed magnets.

D. **None of the above**: This option implies that none of the previously mentioned effects can be a sure test of magnetism.

Among all the options, **B. Attraction** is the most appropriate answer since attraction to ferromagnetic materials is a clear and definitive characteristic of magnetism.

### Final Answer
**B. Attraction**

_________ is the sure test of magnetism.A. RotationB. AttractionC. RepulsionD. None of the above

Question

_________ is the sure test of magnetism.

Solution

Final Answer

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