Question

Three identical capacitors $A,BandC$ are charged to the same potential and then made to discharge through three resistance $R_A>R_B>R_C$. Their potential differences (V) are plotted against time $t$, giving the curves 1,2 and 3. Choose the incorrect option.

• A. $1\to A$
• B. $2\to B$
• C. $1\to C$
• D. $3\to A$

Answer 1

The correct option is A $1\to A$

In case of discharging of capacitor we have the voltage formula as: $V=V_0{e}^{\left[\frac{-t}{RC}\right]}$

Now the higher value of R will make it more concave so in the given figure 1 is least concave so it has to be wrong. Concavity is tested by checking the slope of the graph.