Q: In P-N junction , the barrier potential offers resistance to
(a) free electrons in n-region and holes in p-region
(b) free electrons in p-region and holes in n-region
(c) only free electrons in n-region
(d) only holes in p-region
Sol: In p-n junction free electrons of n-region and holes of p-region are stopped to migrate due to potential potential barrier across the junction .