48. In an unbiased p − n junction, holes diffuse from the p-region to n-region because of ___ ?
(a) the potential difference across the p − n junction.
(b) the attraction of free electrons of n-region.
(c) the higher hole concentration in p-region than that in n-region.
(d) the higher concentration of electrons in the n-region than that in the p-region.
Answer : (c) the higher hole concentration in p-region than that in n-region.
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