For a given electric current,the drift velocity of conduction electrons in a copper wire is $v_d$ and their mobility is $\mu$. When the current is increased at constant temperature,
- A$v_d$ increases,$\mu$ remains the same
- B$v_d$ remains the same,$\mu$ increases
- C$v_d$ decreases,$\mu$ remains the same
- D$v_d$ remains the same,$\mu$ decreases
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