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Which mechanism causes a semiconductor transistor to switch off when the gate voltage is insufficient?

A)Insufficient energy overcoming the band gap
B)Increased electron-hole recombination rate
C)Decreased carrier mobility within channel
D)Reduced electric field penetration depth

💡 Explanation

Insufficient voltage reduces the energy of the charge carriers below the semiconductor's band gap energy; insufficient voltage means no current flows because electrons cannot jump the energy levels, therefore transistor switches off, rather than recombination or reduced carrier mobility shutting it down.

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