(a) What are the readings of the ammeters `A_(1)` and `A_(2)` shown in the figure.neglect the resistance of the meters.
(b) Calculate the current through the circuit and the potential difference across the diode shown in the figure. The drift current fo the diode is `20muA`.
(c ) Each of the resistances shown in the figure has a value of `20Omega`. find the equivalent resistance between `A` and `B`. Does it depend on whether the point `A` or `B` is at higher potential?

Explanation

(a)
Diode is in reverse bias, `i_(1)=0`
`i_(2)=(2)/(10)=0.2A`
(b)
`p.d.` across `20Omega=20xx10^(-6)xx20`
`=0.0004V`
`p.d.` across diode=`5-0.0004`
`=4.9996V`
(c )
This is balanced wheatstone bridge.
`R_(eq)=20Omega`