The heat produced per unit time, on passing electric current through a conductor at a given temperature is directly proportional to the .....

Options

A. 10 mA
B. 6.67 mA
C. 5 mA
D. 3.33 mA

Answer

D

Explanation

3.33 mA
Voltage drop across resistance `R_(2)`
`V_(2)=V_(Z)=10V`
Current flow from `R_(2)`
`I_(2)=(V_(2))/(R_(2))=(10)/(1500)`
`=6.67xx10^(-3)A=6.67 mA`
Voltage drop across resistance `R_(1)`
`V_(1)=15V-V_(2)`
`=15-10`
`=5V`
Current flow from `R_(1)`
`I_(1)=(V_(1))/(R_(1))=(5)/(500)=10^(-2)A`
`therefore I_(1)=10mA`
Current flow from zener diode,
`I_(Z)=I_(1)-I_(2)`
`=(10-6.67)mA=3.33mA`