A 20 μF capacitor is joined to a battery of emf 6.0 V through a resistance of 100 Ω. Find the charge on the capacitor 2.0 ms after the connections are made.
Q = Q.e−tRC
=2×103102.20×10−6
= 120×10−6e
= 120×10−6e−1
=76μC
A capacitor of capacitance 8.0 μF is connected to a battery of emf 6.0 V through a resistance of 24 Ω. Find the current in the circuit (a) just after the connections are made and (b) one time constant after the connections are made.
A parallel-plate capacitor has plate are 20 cm^{2, plate separation 1.0 mm and a dielectric slab of dielectric constant 5.0 filling up the space between the plates. This capacitor is joined to a battery of emf 6.0 V through a 100 k Ω resistor. Find the energy of the capacitor 8.9 μsafter the connections are made.