JEE Main 2015 · 10 Apr · Shift 1 · Physics Q29

PhysicsSingle correct+4 / -1Question 29 of 90

In an unbiased n-p junction electrons diffuse from n - region to p - region because :

holes in p - region attract them

electrons travel across the junction due to potential difference

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

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

Answer and worked solution

Official answer: C

Diffusion is driven by the concentration gradient: there are many more electrons in the n-region than in the p-region.

JEE Main 2015 · 10 Apr · Shift 1, Physics question 29