A diode having potential difference $0.5 V$ across its junction which does not depend on current, is connected in series with resistance of $20 \Omega$ 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$5 V$
[DCE 2005]
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