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test question about circuitrywith diodes

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diode is ideal 2

The 5V battery is still shorted by two diodes in series.
The 10V battery is fine because it has the 10k resistor limiting the current.
 

diode is ideal 2

It is the same circuit! No change in circuit, no change in results.
 

diode is ideal 2

i believe the current will be less- coz the diodes are ideal there will be big current flow from 5V battery (according to diode equation ). it will cause about 2,5V voltage drop at each diode. so the voltage across R wil be 7,5V - not exactly but the difference will be negligible.
So the current will be about 0,75mA
 

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