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[" 15.If the ratio of the concentration ...

[" 15.If the ratio of the concentration of electrons to that of holes in a semiconductor is "(7)/(5)" and the ratio of "],[" currents is "(7)/(4)" ,then what is the ratio of their drift velocities "-],[[" (A) "(5)/(4)," (B) "(4)/(7)," (C) "(5)/(8)," (D) "(4)/(5)]]

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