EASY
12th CBSE
IMPORTANT
Earn 100

Find the P.E. associated with a charge'q' if it were present at the point P with respect to the 'set-up' of two charged spheres, arranged as shown in figure below. Here O is the mid-point of the line O1O2.

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Important Questions on Electrostatic Potential and Capacitance

EASY
12th CBSE
IMPORTANT

A sheet of aluminium foil of negligible thickness is placed between the plates of a capacitor, as shown in figure below. What effect has it on the capacitance if the foil is electrically insulated.

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EASY
12th CBSE
IMPORTANT

A sheet of aluminium foil of negligible thickness is placed between the plates of a capacitor, as shown in figure below. What effect has it on the capacitance if the foil is connected to the upper plate with a conducting wire?

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EASY
12th CBSE
IMPORTANT

The graph below shows the variation of voltageV across the plates of two capacitors A and B versus increase of charge Q stored on them. Which of the capacitors has higher capacitance? Give reason for your answer.

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EASY
12th CBSE
IMPORTANT

The given graph shows the variation of charge q versus potential difference V for two capacitors C1 and C2. The two capacitors have same plate separation but the plate area of C2 is double than that of C1. Which of the lines in the graph correspond to C1 and C2 and why?

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EASY
12th CBSE
IMPORTANT

As shown in the figure below, a dielectric material of dielectric constant k is instead in half proportion between the plates of a parallel-plate capacitor. If its initial capacitance is C, what is the new capacitance?

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EASY
12th CBSE
IMPORTANT

Two identical capacitors of plate dimensions l×b and plate separation d have dielectric slabs filled in between the space of the plates as shown in figures (a) and (b). Obtain the relation between the dielectric constants k, k1 and k2.

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MEDIUM
12th CBSE
IMPORTANT

Find the capacitance of three parallel plates, each of area A metre2 and separated by d1 and d2 metre. The in-between spaces are filled with dielectrics of relative permittivity ε1 and ε2. The permittivity of free space is ε0.

EASY
12th CBSE
IMPORTANT

Figure below shows two capacitors joined in series, the rigid central section of length b being movable. Prove that the equivalent capacitance of the combination is independent of the position of the central section.

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