Time constant of a C-R circuit is second. Capacitor is discharged at time t = 0. The ratio of charge on the capacitor at time t = 2s and t = 6s is
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Four plates are arranged as shown in the diagram. If area of each plate is A and the distance between two neighboring parallel plates is d, then the capacitance of this system will be
Force acting upon a charged particle kept between the plates of a charged condenser is F. If one of the plate of the condenser is removed, force acting on the same particle becomes
In the combination shown in the figure, the ideal voltmeter reading will be
A parallel plate capacitor of plate area A and separation d is filled with two materials each of thickness d/2 and dielectric constants ∈1 and ∈2 respectively. The equivalent capacitance will be
For the circuit shown in figure, the equivalent capacitance of the combination is
Between the plates of parallel plate condenser a plate of thickness t1 and dielectric constant k1 is placed in the rest of the space, there is another plate of thickness t2 and dielectric constant k2. The potential difference across the condenser will be
In the figure shown, the effective capacitance between the points P and Q, if each has capacitance C is
Two spherical conductor A and B of radii a and b (b > a) are placed concentrically in air. A is given a charge +Q while B is earthed. Then the equivalent capacitance of the system is