00:01
Hello students in this question we have an operational amplifier that has negative and positive terminal.
00:08
The positive terminal is connected to two resistors which are then connected together and this is 20 kilo ohm and this is 40 kilo ohm and we have v1 input here and v2 input here and we have this is a 50 kilo ohm here which is grounded connected to ground and there is a feedback coming in.
00:37
Of 100 kilo ohm and there is a another 10 kilo ohm connected to the ground.
00:51
So this is a situation this is a vout right so vin is given now we can calculate the voltage at the positive terminal at the positive terminal of the operational amplifier v plus will be equal to v2 times r1 by r1 plus r2.
01:11
So here r1 is this and r2 is this so this will be equal to 0 .2 times 20 by 20 plus 40.
01:26
So that is equal to 0 .0667 volts that is a positive terminal since the operational amplifier is assumed to be ideal with infinite infinite input impedance no current flows through the positive terminal.
01:44
So the voltage at the negative terminal will also be equal to v plus so that is equal to 0 .0667 volts.
01:54
Now in this case rf feedback is given as 100 kilo ohms so we can plug in the values and we can get the i which is current i will be equal to v minus by rf right.
02:14
So i will be equal to v minus which is equal to 0 .0667 divided by rf is equal to 100 kilo ohms so that is 1000 so you will get 0 .667 micro amps that is the current...