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The intrinsic number density of charge c...

The intrinsic number density of charge carriers in a semiconductor is `2.5 xx 10^13 cm^-3`. It is doped with donor atoms of number density `1.25 xx 10^17cm^-3`, the ratio of conductivities of doped and intrinsic semiconductors is

A

5000

B

3000

C

2000

D

1000

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