# In an unbiased n-p junction electrons diffuse from n - region to p - region because : Option 1) holes in p - region attract them Option 2)  electrons travel across the junction due to potential difference Option 3)  electron concentration in n - region is more as compared to that in p - region Option 4) only electrons move from n to p region and not the vice - versa

As we learnt in

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

In unbiased p-n junction, electron diffuse from n region to p region because of concentration gradient.

Correct option is 3.

Option 1)

holes in p - region attract them

This is an incorrect option.

Option 2)

electrons travel across the junction due to potential difference

This is an incorrect option.

Option 3)

electron concentration in n - region is more as compared to that in p - region

This is the correct option.

Option 4)

only electrons move from n to p region and not the vice - versa

This is an incorrect option.

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