HCV: An electric field is applied to a semiconductor. Let the number of charge carriers be n and the

An electric field is applied to a semiconductor. Let the number of charge carriers be n and the average drift speed be v. If the temperature is increased,
1.  both n and v will increase
2.  n will increase but v will decrease
3.  v will increase but n will decrease
4.  both n and v will decrease.

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