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What exactly is the difference between ac Josephson Effect and DC Jsephson effect?

**What is the relevence of magnetic field here?In which cases are potentials applied?I tried to find the answer in the net,but couldn't find any satisfactory explanations.I have not begun to study quantum mechanics in detail.Can someone help me?Please explain in simple terms.**

__When does each occur?__PS:Equations are not very important as far as I am concerned.I just want to get an idea about the phenomenon.