Physics-
General
Easy
Question
A capacitor of capacitance C is charged to a potential difference V from a cell and then disconnected from it. A charge +Q is now given to its positive plate. The potential difference across the capacitor is now
- V
The correct answer is:
Related Questions to study
physics-
An empty thick conducting shell of inner radius a and outer radius b is shown in figure. If it is observed that the inner face of the shell carries a uniform charge density -s and the surface carries a uniform charge density 's'
If another point charge is also placed at a distance the center of shell, then choose the correct statements
An empty thick conducting shell of inner radius a and outer radius b is shown in figure. If it is observed that the inner face of the shell carries a uniform charge density -s and the surface carries a uniform charge density 's'
If another point charge is also placed at a distance the center of shell, then choose the correct statements
physics-General
physics-
An empty thick conducting shell of inner radius a and outer radius b is shown in figure. If it is observed that the inner face of the shell carries a uniform charge density -s and the surface carries a uniform charge density 's'
If a point charge is placed at the center of the shell, then choose the correct statement(s)
An empty thick conducting shell of inner radius a and outer radius b is shown in figure. If it is observed that the inner face of the shell carries a uniform charge density -s and the surface carries a uniform charge density 's'
If a point charge is placed at the center of the shell, then choose the correct statement(s)
physics-General
physics-
Four initially uncharged thin, large, plane identical metallic plates A, B, C and D are arranged parallel to each other as shown. Now plates A, B, C and D are given charges Q,2Q,3Q and 4Q respectively. Plates A and D are connected by a metallic wire while plates B and C are connected by other metallic wire then after Electrostatic equilibrium is reached.
Total charge on plates after earthing plates A and B will be
Four initially uncharged thin, large, plane identical metallic plates A, B, C and D are arranged parallel to each other as shown. Now plates A, B, C and D are given charges Q,2Q,3Q and 4Q respectively. Plates A and D are connected by a metallic wire while plates B and C are connected by other metallic wire then after Electrostatic equilibrium is reached.
Total charge on plates after earthing plates A and B will be
physics-General
physics-
Four initially uncharged thin, large, plane identical metallic plates A, B, C and D are arranged parallel to each other as shown. Now plates A, B, C and D are given charges Q,2Q,3Q and 4Q respectively. Plates A and D are connected by a metallic wire while plates B and C are connected by other metallic wire then after Electrostatic equilibrium is reached.
Charge on plate D after earthing it will be
Four initially uncharged thin, large, plane identical metallic plates A, B, C and D are arranged parallel to each other as shown. Now plates A, B, C and D are given charges Q,2Q,3Q and 4Q respectively. Plates A and D are connected by a metallic wire while plates B and C are connected by other metallic wire then after Electrostatic equilibrium is reached.
Charge on plate D after earthing it will be
physics-General
physics-
Four initially uncharged thin, large, plane identical metallic plates A, B, C and D are arranged parallel to each other as shown. Now plates A, B, C and D are given charges Q,2Q,3Q and 4Q respectively. Plates A and D are connected by a metallic wire while plates B and C are connected by other metallic wire then after Electrostatic equilibrium is reached.
Charge on left surface of plate B will be
Four initially uncharged thin, large, plane identical metallic plates A, B, C and D are arranged parallel to each other as shown. Now plates A, B, C and D are given charges Q,2Q,3Q and 4Q respectively. Plates A and D are connected by a metallic wire while plates B and C are connected by other metallic wire then after Electrostatic equilibrium is reached.
Charge on left surface of plate B will be
physics-General
physics-
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 C 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 C with charge +Q is now introduced midway between A and B. Which of the following statements is not correct?
physics-General
physics-
Mark the correct options:
Mark the correct options:
physics-General
physics-
X and Y are large, parallel conducting plates closed to each other. Each face has an area A. X is given a charge Q.Y is without any charge. Points A, B and C are as shown in figure.
X and Y are large, parallel conducting plates closed to each other. Each face has an area A. X is given a charge Q.Y is without any charge. Points A, B and C are as shown in figure.
physics-General
physics-
An electric field converges at the origin whose magnitude is given by the expression 
Coul, where is the distance measured from the origin.
An electric field converges at the origin whose magnitude is given by the expression Coul, where is the distance measured from the origin.
physics-General
physics-
An e.m.f. 
volt is applied to an LR-circuit of inductance 3mH and resistance 4 ohms. The amplitude of current in the circuit is
An e.m.f. volt is applied to an LR-circuit of inductance 3mH and resistance 4 ohms. The amplitude of current in the circuit is
physics-General
physics-
The voltage across a pure inductor is represented by the following diagram. Which one of the following diagrams will represent the current
The voltage across a pure inductor is represented by the following diagram. Which one of the following diagrams will represent the current
physics-General
physics-
The current in a discharging LR circuit is given by where is the time constant of the circuit. Calculate the rms current for the period t=0 to 
.
The current in a discharging LR circuit is given by where is the time constant of the circuit. Calculate the rms current for the period t=0 to .
physics-General
physics-
Alternating current cannot be measured by dc ammeter because
Alternating current cannot be measured by dc ammeter because
physics-General
physics-
A physics lab is designed to study the transfer of electrical energy from one circuit to another by means of a magnetic field using simple transformers. Each transformer has two coils of wire electrically insulated from each other but wound a round a common core of ferromagnetic material. The two wires are close together but do not touch each other
The primary coil is connected to a sorce of alternating current. The secondary coil is connected to resistor such as a light bulb. The AC source produces an oscillating voltage and current in the primary coil that produces an oscillating magnetic field in the core material. This in turn induces an oscillating voltage and AC current in the secondary coil
Students collected the following data comparing the number of turns per coil (N), the voltage (V) and the current (I) in the coils of three transformers.
A 12 V battery is used to supply 2.0 mA of current to the 300 turns in the primary coil of a given transformer. What is the current in the secondary coil if turns
A physics lab is designed to study the transfer of electrical energy from one circuit to another by means of a magnetic field using simple transformers. Each transformer has two coils of wire electrically insulated from each other but wound a round a common core of ferromagnetic material. The two wires are close together but do not touch each other
The primary coil is connected to a sorce of alternating current. The secondary coil is connected to resistor such as a light bulb. The AC source produces an oscillating voltage and current in the primary coil that produces an oscillating magnetic field in the core material. This in turn induces an oscillating voltage and AC current in the secondary coil
Students collected the following data comparing the number of turns per coil (N), the voltage (V) and the current (I) in the coils of three transformers.
A 12 V battery is used to supply 2.0 mA of current to the 300 turns in the primary coil of a given transformer. What is the current in the secondary coil if turns
physics-General
physics-
A physics lab is designed to study the transfer of electrical energy from one circuit to another by means of a magnetic field using simple transformers. Each transformer has two coils of wire electrically insulated from each other but wound around a common core of ferromagnetic material. The two wires are close together but do not touch each other
The primary coil is connected to a source of alternating (AC) current. The secondary coil is connected to resistor such as a light bulb. The AC source produces an oscillating voltage and current in the primary coil that produces an oscillating magnetic field in the core material. This in turn induces an oscillating voltage and AC current in the secondary coil
Students collected the following data comparing the number of turns per coil (N), the voltage (V) and the current (I) in the coils of three transformers.
Which of the following is a correct expression for R, the resistance of the load connected to the secondary coil
A physics lab is designed to study the transfer of electrical energy from one circuit to another by means of a magnetic field using simple transformers. Each transformer has two coils of wire electrically insulated from each other but wound around a common core of ferromagnetic material. The two wires are close together but do not touch each other
The primary coil is connected to a source of alternating (AC) current. The secondary coil is connected to resistor such as a light bulb. The AC source produces an oscillating voltage and current in the primary coil that produces an oscillating magnetic field in the core material. This in turn induces an oscillating voltage and AC current in the secondary coil
Students collected the following data comparing the number of turns per coil (N), the voltage (V) and the current (I) in the coils of three transformers.
Which of the following is a correct expression for R, the resistance of the load connected to the secondary coil
physics-General
