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Substances which are repelled by the ext...

Substances which are repelled by the external magnetic field are called

A

diamagnetic

B

paramagnetic

C

ferromagnetic

D

antiferromagnetic

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To solve the question regarding substances that are repelled by an external magnetic field, we can follow these steps: ### Step-by-Step Solution: 1. **Understanding Magnetic Properties**: - Substances can exhibit different magnetic behaviors when placed in an external magnetic field. The main types are diamagnetic, paramagnetic, ferromagnetic, and antiferromagnetic. 2. **Identifying Diamagnetic Substances**: - Diamagnetic substances are characterized by the absence of unpaired electrons. This means that all the electrons in these substances are paired. 3. **Behavior in Magnetic Fields**: - When an external magnetic field is applied, diamagnetic substances are not attracted to the magnetic field. Instead, they are repelled by it. This is a key characteristic of diamagnetism. 4. **Contrasting with Other Types**: - In contrast, paramagnetic substances have unpaired electrons and are attracted to magnetic fields. Ferromagnetic substances can also be attracted to magnetic fields and can retain magnetization. Antiferromagnetic substances exhibit a complex behavior but are generally attracted to magnetic fields as well. 5. **Conclusion**: - Based on the definitions and behaviors discussed, the substances that are repelled by an external magnetic field are classified as **diamagnetic**. ### Final Answer: **Diamagnetic substances are repelled by an external magnetic field.** ---
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