When a semiconducting device is connected in series with a battery and a resistance, a current is found to flow in the circuit. If, however, the polarity of the battery is reversed, practically no current flows in the circuit. The device may be
- Aa $p$-type semiconductor
- Ba $n$-type semiconductor
- Can intrinsic semiconductor
- Da $p-n$ junction
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When a forward bias is applied to a $p-n$ junction,it $\qquad$ .
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