The equivalent capacitance of the circuit given between A and B is
Step 1: Analyze the given circuit.
The circuit consists of capacitors arranged in a combination of series and parallel.
Step 2: Simplify the circuit
step by step.
- The first two capacitors (each \( 4 \, \mu F \)) are in parallel, so their equivalent capacitance is: \[ C_1 = 4 \, \mu F + 4 \, \mu F = 8 \, \mu F \] - This combined capacitance is in series with the third \( 4 \, \mu F \) capacitor, so the equivalent capacitance is: \[ \frac{1}{C_{\text{eq}}} = \frac{1}{8 \, \mu F} + \frac{1}{4 \, \mu F} \] \[ \frac{1}{C_{\text{eq}}} = \frac{1}{8} + \frac{1}{4} = \frac{3}{8} \] \[ C_{\text{eq}} = \frac{8}{3} \, \mu F \]
Step 3: Conclusion.
Thus, the equivalent capacitance between A and B is 6 \( \mu F \).
Conclusion:
The correct answer is (B) 6 \( \mu F \).
The energy stored in the capacitor after closing the key K is