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Match the materials listed in Group I with the most appropriate applications listed in Group II.
Match the materials listed in Group I with the most appropriate applications listed in Group II.
| Group I | Group II |
| P. Iron-silicon alloy | 1. Heating element |
| Q. GaAs | 2. Ultrasonic generator |
| R. Nichrome | 3. Transformer core |
| S. Quartz crystals | 4. Light emitting diode |
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