In the figure, potential difference between A and B is

Options

A. zero
B. 5 V
C. 10 V
D. 15 V

Answer

C

Explanation

Here p-n junction is forward biased. If p-n junction is ideal, its resistance is zero. The effective resistance across A and B
`=(10xx10)/(10+10) = 5KOmega`
Current in the circuit, `I=(V)/(R )=(30)/(15xx10^(3))=(2)/(10^(3))A`
Current in arm `AB=I=(2)/(10^(3))`
Potential difference across A and B
`=(2)/(10^(3))xx5xx10^(3)=10V`