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On doping Ge metal with a little of In or Ga, one gets

1. p-type semi conductor
2. n-type semi conductor
3. insulator
4. rectifier

Correct answer: p-type semi conductor

Solution

When Ge (a group 14 element) is doped with In or Ga (group 13 elements), it introduces holes as the majority charge carriers, forming a p-type semiconductor.

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