1.

In Figassuming the diodes to be ideal :

Answer»

`D_(1)` is forward biased and `D_(2)` is reverse biased and HENCE current FLOW form A to B
`D_(2)` is forward biased and `D_(1)` is reverse biased and hence no current flows from B to A and vice versa
`D_(1) and D_(2)` are both forward biased and hence current flows from A to B
`D_(1) and D_(2)` areboth reverse biased and hence no current flows from A to B and vice-versa

Answer :B


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