Physics-
General
Easy
Question
Four capacitors and a battery are connected as shown. The potential drop across the 
capacitor is 6 V. Then the :
- potential difference across the 12mF capacitor is 10 V.
- charge on the 3mF capacitor is 42mC
- e.m.f. of the battery is 30 V
- All of the above
The correct answer is: All of the above
Related Questions to study
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In the circuit shown, each capacitor has a capacitance C. The emf of the cell is E. If the switch S is closed
In the circuit shown, each capacitor has a capacitance C. The emf of the cell is E. If the switch S is closed
physics-General
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Find the equivalent capacitance across A & B
Find the equivalent capacitance across A & B
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A capacitor is made of a flat plate of area A and a second plate having a stair-like structure as shown in figure. The width of each stair is a and the height is b. Find the capacitance of the assembly.
A capacitor is made of a flat plate of area A and a second plate having a stair-like structure as shown in figure. The width of each stair is a and the height is b. Find the capacitance of the assembly.
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The distance between plates of a parallel plate capacitor is 5 d. Let the positively charged plate is at x=0 and negatively charged plate is at x=5 d. Two slabs one of conductor and other of a dielectric of equal thickness 
are inserted between the plates as shown in figure. Potential versus distance graph will look like :
The distance between plates of a parallel plate capacitor is 5 d. Let the positively charged plate is at x=0 and negatively charged plate is at x=5 d. Two slabs one of conductor and other of a dielectric of equal thickness are inserted between the plates as shown in figure. Potential versus distance graph will look like :
physics-General
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The plates S and T of an uncharged parallel plate capacitor are connected across a battery. The battery is then disconnected and the charged plates are now connected in a system as shown in the figure. The system shown is in equilibrium. All the strings are insulating and massless. The magnitude of charge on one of the capacitor plates is: [Area of plates =A ]
The plates S and T of an uncharged parallel plate capacitor are connected across a battery. The battery is then disconnected and the charged plates are now connected in a system as shown in the figure. The system shown is in equilibrium. All the strings are insulating and massless. The magnitude of charge on one of the capacitor plates is: [Area of plates =A ]
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What is the potential of point a with respect to point b in figure when switch S is open ?
What is the potential of point a with respect to point b in figure when switch S is open ?
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Plates A and B constitute an isolated, charge parallel-plate capacitor. The inner surfaces (I and IV) of A and B have charges +Q and -Q respectively. A third plate 
with charge +Q is now introduced midway between A and B. Which of the following statements is not correct?
Plates A and B constitute an isolated, charge parallel-plate capacitor. The inner surfaces (I and IV) of A and B have charges +Q and -Q respectively. A third plate with charge +Q is now introduced midway between A and B. Which of the following statements is not correct?
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Three identical metal plates with large surface areas are kept parallel to each other as shown in figure. The leftmost plate is given a charge Q, the rightmost a charge -2Q and the middle one remains neutral. Find the charge appearing on the outer surface of the rightmost plate.
Three identical metal plates with large surface areas are kept parallel to each other as shown in figure. The leftmost plate is given a charge Q, the rightmost a charge -2Q and the middle one remains neutral. Find the charge appearing on the outer surface of the rightmost plate.
physics-General
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Find the potential difference 
between the points a and b shown in each part of the figure.
Find the potential difference between the points a and b shown in each part of the figure.
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Four identical plates 1,2,3 and 4 are placed parallel to each other at equal distance as shown in the figure. Plates 1 and 4 are joined together and the space between 2 and 3 is filled with a dielectric of dielectric constant k=2. The capacitance of the system between 1 and 3&2 and 4 are 
and 
respectively. The ratio 
is :
Four identical plates 1,2,3 and 4 are placed parallel to each other at equal distance as shown in the figure. Plates 1 and 4 are joined together and the space between 2 and 3 is filled with a dielectric of dielectric constant k=2. The capacitance of the system between 1 and 3&2 and 4 are and respectively. The ratio is :
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A parallel plate capacitor has two layers of dielectric as shown in figure. This capacitor is connected across a battery. The graph which shows the variation of electric field (E) and distance (x) from left plate.
A parallel plate capacitor has two layers of dielectric as shown in figure. This capacitor is connected across a battery. The graph which shows the variation of electric field (E) and distance (x) from left plate.
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The figure shows a charge q placed inside a cavity in an uncharged conductor. Now if an external electric field is switched on
The figure shows a charge q placed inside a cavity in an uncharged conductor. Now if an external electric field is switched on
physics-General
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A charge Q is placed at a distance of 4R above the centre of a disc of radius R. The magnitude of flux through the disc is 
. Now a hemispherical shell of radius R is placed over the disc such that it forms a closed surface. The flux through the curved surface taking direction of area vector along outward normal as positive, is
A charge Q is placed at a distance of 4R above the centre of a disc of radius R. The magnitude of flux through the disc is . Now a hemispherical shell of radius R is placed over the disc such that it forms a closed surface. The flux through the curved surface taking direction of area vector along outward normal as positive, is
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A simple electric dipole consists of a positive and negative charge of equal magnitude held very close to one another. The components of the electric field pointing away from a dipole has magnitude. 
where is the distance from the center of the dipole to the point in question, 
is a universal constant and p in the magnitude of the dipole moment vector, which specifics the strength and direction of the dipole. Here, 
denotes the angle between the dipole moment vector and d, the displacement vector (from the dipole to the point in question).
A student performs an experiment to determine if a mystery object is an electric dipole. (The mystery object is only a few millimeters long) Using a sophisticated instrument, the student measures the component of the electric field pointing away from the object, at various distances from the center of the object. By taking each measurement along an imaginary line emanating outward from the center of the mystery object, he ensures that stays the same throughout the experiments. Table 1 shows the electric field be found at various distances.
Consider the electric field produced by a dipole. If the dipole moment and the distance from the dipole are both doubled, while is kept the same, the electric field component pointing away from the dipole decreases by a factor of :
A simple electric dipole consists of a positive and negative charge of equal magnitude held very close to one another. The components of the electric field pointing away from a dipole has magnitude. where is the distance from the center of the dipole to the point in question, is a universal constant and p in the magnitude of the dipole moment vector, which specifics the strength and direction of the dipole. Here, denotes the angle between the dipole moment vector and d, the displacement vector (from the dipole to the point in question).
A student performs an experiment to determine if a mystery object is an electric dipole. (The mystery object is only a few millimeters long) Using a sophisticated instrument, the student measures the component of the electric field pointing away from the object, at various distances from the center of the object. By taking each measurement along an imaginary line emanating outward from the center of the mystery object, he ensures that stays the same throughout the experiments. Table 1 shows the electric field be found at various distances.
Consider the electric field produced by a dipole. If the dipole moment and the distance from the dipole are both doubled, while is kept the same, the electric field component pointing away from the dipole decreases by a factor of :
physics-General
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Two insulated light rods of length l and 2l are placed in xy plane such their mid point is origin and they are free to rotate in xy plane about z-axis. Two +q charges are fixed at two ends of bigger rod and two - q charges are fixed at two ends of smaller rod.
Work done to rotate smaller rod through 180° about z-axis
Two insulated light rods of length l and 2l are placed in xy plane such their mid point is origin and they are free to rotate in xy plane about z-axis. Two +q charges are fixed at two ends of bigger rod and two - q charges are fixed at two ends of smaller rod.
Work done to rotate smaller rod through 180° about z-axis
physics-General
