Q. 585.0( 3 Votes )
(a) Find the curr
Potential Difference (V) across a resistor of resistance R when current I passes through it is given by Ohm’s law:
Kirchhoff’s junction rule:
The sum of currents entering a junction is equal to the sum of currents leaving it.
Kirchhoff’s loop rule:
The sum of potential differences around a closed loop is zero.
Energy stored by a capacitor:
If the potential difference between the two conductors of the capacitor is V and its capacitance is C, its energy is given by:
Using Kirchhoff’s law on loop FEABF,
Using Kirchhoff’s law on loop ACDBA,
Solving (1) and (2), we get
At steady state, no current passes through the capacitor; hence, the results are the same as in (a).
Now, the potential as the capacitor is in parallel with the 20Ω resistor,
Hence, the energy stored by the capacitor is 32μJ.
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