A potential barrier of 0.50 V exists across a P-N junction. If the depletion region is 5.0×10-7m wide, the intensity of the electric field in this region is 
(a) 1.0×106 V/m                      (b) 1.0×105 V/m
(c) 2.0×105 V/m                      (d) 2.0×106 V/m

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