Question

While charging the capacitor,,,why isnt the current constant??? why does it decrease?

Answer 1

The total voltage drop through the circuit is always equal to the potential of the battery. This will be equal to the voltage drop across resistors, plus the potential of the capacitor. As the charge on the capacitor goes up, its potential increases, so the voltage drop across resistance must go down to maintain same total battery voltage. Less voltage -> less current.

Answer 2

As the capacitor charges, it gets harder and harder to add more charge. In time, no more charge can be added and the current stops completely.

Answer 3

it's like water buliding up behind a damn. at first, it's easy to put charge on a capacitor plate because there's lots of room. as the plate becomes increasingly charged, it becomes harder to put additional electrons in a place where there is already a lot of electrons that also have the same negative charge so there's a repulsion, too.

Answer 4

That's a good way to express it, douglaswins. As the capacitor acquires more charge, the total resistance goes up. By Ohm's law, more resistance for the same total voltage -> less current.

Answer 5

Thank u !!