A diode having potential difference 0.5 V across its junction which does not depend on current, is connected in series with resistance of 20 Ω across source. If 0.1 A passes through resistance then what is the voltage of the source

(a) 1.5 V                     (b) 2.0 V
(c) 2.5 V                     (d) 5 V

(c)

V' = V+IR                                                   

         = 0.5 + 0.1 x 20

         =  2.5 V

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