Physics-
General
Easy
Question
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?
- The surfaces I and II will have equal and opposite charges.
- The surfaces III and IV will have equal and opposite charges.
- The charge on surface III will be greater than Q.
- The potential difference between A and C will be equal to the potential difference between C and B.
The correct answer is: The potential difference between A and C will be equal to the potential difference between C and B.
Related Questions to study
physics-
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
physics-
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.
physics-General
physics-
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 :
physics-General
physics-
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.
physics-General
physics-
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
physics-
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
physics-General
physics-
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
physics-
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
physics-
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.
Electric field at point (a,0,0) is E. Now if a>>l then
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.
Electric field at point (a,0,0) is E. Now if a>>l then
physics-General
physics-
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.
What is electric dipole moment of system ?
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.
What is electric dipole moment of system ?
physics-General
physics-
Three points charges are placed at the corners of an equilateral triangle of side L as shown in the figure.
Three points charges are placed at the corners of an equilateral triangle of side L as shown in the figure.
physics-General
physics-
In the circuit shown in figure : 
and 
mF. Current in 
circuit is 
in 
circuit is 
and the main current is 
Phase different between and is
In the circuit shown in figure : and mF. Current in circuit is in circuit is and the main current is Phase different between and is
physics-General
physics-
In the LCR circuit shown in figure
A) current will lead the voltage
B) rms value of current is 20 A
C) power factor of the circuit is 
D) voltage drop across resistance is 100 V
In the LCR circuit shown in figure
A) current will lead the voltage
B) rms value of current is 20 A
C) power factor of the circuit is
D) voltage drop across resistance is 100 V
physics-General
physics-
In the circuit shown in fig. If both the lamps 
and 
are identical.
In the circuit shown in fig. If both the lamps and are identical.
physics-General
physics-
The vector diagram of current and voltage for a circuit is as shown. The components of the circuit will be
The vector diagram of current and voltage for a circuit is as shown. The components of the circuit will be
physics-General
