The direction of electric field at 
junction in an unbiased junction diode
A
Is from 
-side to 
-side of the junction
-side to -side of the junction B
Is from 
-side to 
-side of the junction
-side to -side of the junction C
Does not have a fixed direction
D
No electric field exists in the depletion layer
Text Solution
Verified by ExpertsThe correct answer is:
A
In an unbiased (no external voltage) P-N junction, a depletion region forms at the junction due to diffusion of electrons and holes. This creates immobile ions:
Negative ions on the 
-side
Positive ions on the 
-side
These ions set up an internal electric field that opposes further diffusion.
The direction of the electric field is from the positive ions to the negative ions, i.e., from N -side to P side.
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