# A semiconductor device is connected in a series circuit with a battery and a resistance. A current is found to pass through the circuit. If the polarity of the battery is reversed, the current drops almost to zero. The device may be Option 1) A P-type semiconductor Option 2) An N-type semiconductor Option 3) A PN-junction Option 4) An intrinsic semiconductor

P Plabita

P -N junction as diode -

It is a one way device. It offers a low resistance when forward biased and high resistance when reverse biased.

- wherein

R = 0, Forward

$\rightarrow \infty$ Reverse

For a PN Junction current easily flow when it is in forward bias and it almost become zero when it is reverse bias.

Option 1)

A P-type semiconductor

Incorrect

Option 2)

An N-type semiconductor

Incorrect

Option 3)

A PN-junction

Correct

Option 4)

An intrinsic semiconductor

Incorrect

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