1.

The junction diode in the following circuit requires a minimum current of 1 mA to be above the knee point (0.7V) of its 1-V characteristic curve . The voltage across the diode is independent of current above the knee point . If V_B = 5V , then the maximum value of R so that the voltage is above the knee point will be

Answer»

`4.3kOmega`
`5.5kOmega`
`4.8kOmega`
`8.6kOmega`

Solution :At knee POINT voltage ACROSS the diode is 0.7 V
Hence voltage across RESISTANCE R is 5 - 0.7
`=4.3V`
usig `V = iR implies 4.3 = 1XX10^(-3)xxR implies R = 4.3kOmega`


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