00:01
Hello students, in this question given as an operational amplifier circuit and in this question given as the current, output current of the op -amp is given as the 5 ma and beta is given as the 100 and now we have to calculate the resistance.
00:25
So we know that the emitter voltage is equals to, that is the at input, now according to the circuit, the emitter voltage will be equal to the 10 volt minus vbe, so vbe is equals to minus, sorry 0 .7, so this will be equal to the 9 .3 volt.
00:48
Now the current, emitter current will be equal to this voltage upon the value of r resistance equation number 1.
00:59
Now we know that the emitter current is equals to the 1 plus beta into base current, so this will be equal to the beta is given as the 100 and base current will be equal to the i0 according the circuit given.
01:17
Now you can see the i0 value is given as the 5 ma, so after calculation we will get the emitter current is equals to 505 ma.
01:31
Now we will substitute this value in the equation number 1, so after calculation we will get the resistance is equals to 9 .3 upon 505, so this will be equal to the 18 .41 ohm, this is the milliampere...