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In figure, assuming the diodes to be ide...

In figure, assuming the diodes to be ideal,

A

`D_(1) and D_(2)` are both forward biased and hence current flows from A to B

B

`D_(1) and D_(2)`are both reverse biased and hence no current flows from A to B

C

`D_(1)` is forward biased and `D_(2)` is reverse biased and hence current flows from A to B

D

`D_(2)` is forward biased and `D_(1)` is reverse biased and hence no current flows from B to A

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