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The value of one farad in e.s.u. is-

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Important Questions on Electrostatic Potential and Capacitance

EASY

The dimensional formula of capacitance is _______.

Take Q as the dimension formula of charge.

EASY
The charge on a capacitor plate in a circuit, as a function of time, is shown in the figure:
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What is the value of current at t=4 s?
MEDIUM
Consider the combination of two capacitors C1 and C2, with C2>C1, when connected in parallel, the equivalent capacitance is 10 times the equivalent capacitance of the same connected in series. Calculate the ratio of capacitors, C2C1.
EASY
An electrician requires a capacitance of 6μF in a circuit across a potential difference of 1.5kV. A large number of 2μF capacitors which can withstand a potential difference of not more than 500 V are available. The minimum number of capacitors required for the purpose is
MEDIUM
In the given circuit, the charge on 4μF capacitor will be:
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EASY

A parallel plate capacitor with plate area 'A' and distance of separation 'd' is filled with a dielectric. What is the capacity of the capacitor when permittivity of the dielectric varies as:

εx=ε0+kx, for 0<xd2

εx=ε0+kd-x, for d2xd

HARD
An initially uncharged capacitor C is being charged by a battery of emf E through a resistance R upto the instant when the capacitor is charged to the potential E/2, the ratio of the work done by the battery to the heat dissipated by the resistor is given by:-
EASY
A parallel plate capacitor is of area 6 cm2 and a separation 3 mm. The gap is filled with three dielectric materials of equal thickness (see figure) with dielectric constant K1=10, K2=12 and K3=14. The dielectric constant of a material which when fully inserted in above capacitor, gives same capacitance would be:

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EASY

In the given circuit diagram,

E=5 V, r=1 Ω, R2=4 Ω, R1=R3=1 Ω and C=3 μF

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Then, what will be the numerical value of charge on each plates of the capacitor.

MEDIUM
A neutral spherical copper particle has a radius of 10 nm1 nm=10-9 m. It gets charged by applying the voltage slowly adding one electron at a time. Then, the graph of the total charge on the particle versus the applied voltage would look like
MEDIUM
A capacitor is connected to a 20 V battery through a resistance of 10Ω. It is found that the potential difference across the capacitor rises to 2 V in 1 μs. The capacitance of the capacitor is ________μF.
Given In 109=0.105
MEDIUM

An electron enters a parallel plate capacitor with horizontal speed μ and is found to deflect by angle θ on leaving the capacitor as shown. It is found that tanθ=0.4 and gravity is negligible.

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If the initial horizontal speed is doubled, then tanθ will be:

HARD

The material filled between the plates of a parallel plate capacitor has resistivity 200 Ω m. The value of capacitance of the capacitor is 2 pF. If a potential difference of 40 V is applied across the plates of the capacitor, then the value of leakage current flowing out of the capacitor is: (given the value of relative permittivity of material is 50)

MEDIUM

Find the total capacitance and total charge on the capacitors

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MEDIUM

As shown in the figure below, if a capacitor C is charged by connecting it with resistance R, then energy given by the battery will be

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EASY

In the figure is shown a system of four capacitors connected across a 10 V battery. The charge that will flow from switch S when it is closed is:
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EASY
A parallel plate capacitor with plates of area 1 m2 each, are at a separation of 0.1 m. If the electric field between the plates is 100 N C-1, the magnitude of charge on each plate is: (Takeε0=8.85×1012 C2 N-1 m-2)
MEDIUM
Sixty four water drops having equal charges combine to form one bigger drop. The capacitance of bigger drop as compared to that of smaller drop will be
HARD

What are the charges stored in the 1 μF and 2 μF capacitors in the circuit below, once the currents become steady?

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HARD

Two identical parallel plate capacitors of capacitance each are connected in series with a battery of emf, E as shown. If one of the capacitors is now filled with a dielectric of dielectric constant k, the amount of charge which will flow through the battery is (neglect internal resistance of the battery)

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