00:01
Hello everybody, we know that for rc circuit the voltage vt can be written as v0 that is the battery voltage into 1 minus e to the power minus t, t is the time, divided by tau.
00:14
Here tau is the time constant, the value of which depends on the product of r into c.
00:23
R is the resistance and c is the capacitance.
00:26
Now here the value of r is equal to 2 kilo ohm or we can write it as 2 into 10 to the power 3 ohm and the value of c is given as 4 micro farad that is 4 into 10 to the power minus 6 farad.
00:46
So tau is equal to rc is equal to 0 .008 that is a constant.
00:55
Now we see in part a of the problem it is said that when t is equal to 0 minus means time is decreasing from 0 or in the b part time is equal to 0 plus so time is increasing.
01:15
For both the cases vt is equal to v0, v0 value is given 1 minus e to the power 0 by tau so vt will be 0 and here v0 is equal to 6ut so vt as vt is equal to 0, 6ut doesn't have any influence on vt...