Physics-
General
Easy
Question
Consider the circuit in the figure. The switch is initially in position A for a sufficiently long time to establish a steady state. At t = 0, the switch is turned to position B. The capacitor 2C did not hold any charge before t = 0.
The time, at which charge in the capacitor C is reduced to half of the value it had at t = 0, is
- 6RC ln2
- 3RC ln2
- 2RC ln2
- 4RC ln2
The correct answer is: 4RC ln2
Related Questions to study
physics-
Consider the circuit in the figure. The switch is initially in position A for a sufficiently long time to establish a steady state. At t = 0, the switch is turned to position B. The capacitor 2C did not hold any charge before t = 0.
The energy lost between t = 0 to t =¥ is
Consider the circuit in the figure. The switch is initially in position A for a sufficiently long time to establish a steady state. At t = 0, the switch is turned to position B. The capacitor 2C did not hold any charge before t = 0.
The energy lost between t = 0 to t =¥ is
physics-General
physics-
Consider the circuit in the figure. The switch is initially in position A for a sufficiently long time to establish a steady state. At t = 0, the switch is turned to position B. The capacitor 2C did not hold any charge before t = 0.
The current decreases exponentially between t = 0 to t = ¥ The time constant is
Consider the circuit in the figure. The switch is initially in position A for a sufficiently long time to establish a steady state. At t = 0, the switch is turned to position B. The capacitor 2C did not hold any charge before t = 0.
The current decreases exponentially between t = 0 to t = ¥ The time constant is
physics-General
physics-
Consider the circuit in the figure. The switch is initially in position A for a sufficiently long time to establish a steady state. At t = 0, the switch is turned to position B. The capacitor 2C did not hold any charge before t = 0.
At 
when a new steady state has been established, the charges held by capacitors C and 2C will respectively be
Consider the circuit in the figure. The switch is initially in position A for a sufficiently long time to establish a steady state. At t = 0, the switch is turned to position B. The capacitor 2C did not hold any charge before t = 0.
At when a new steady state has been established, the charges held by capacitors C and 2C will respectively be
physics-General
physics-
Consider the circuit in the figure. The switch is initially in position A for a sufficiently long time to establish a steady state. At t = 0, the switch is turned to position B. The capacitor 2C did not hold any charge before t = 0.
The magnitude of charge which each plate of capacitor C holds before t = 0 is
Consider the circuit in the figure. The switch is initially in position A for a sufficiently long time to establish a steady state. At t = 0, the switch is turned to position B. The capacitor 2C did not hold any charge before t = 0.
The magnitude of charge which each plate of capacitor C holds before t = 0 is
physics-General
physics-
Figure (A) and (B) show water drop and mercury drop in two identical conical pipes, then
Figure (A) and (B) show water drop and mercury drop in two identical conical pipes, then
physics-General
physics-
Pressure inside a drop of radius r is ____ in comparison to pressure inside a drop of same liquid of radius 2R
Pressure inside a drop of radius r is ____ in comparison to pressure inside a drop of same liquid of radius 2R
physics-General
physics-
A square gate of size 1 m × 1 m is hinged at its mid point. A fluid of density r fills the space to the left of the gate. The force F required to hold the gate stationary is
A square gate of size 1 m × 1 m is hinged at its mid point. A fluid of density r fills the space to the left of the gate. The force F required to hold the gate stationary is
physics-General
physics-
A bent arc shaped sealed glass tube filled with water is accelerated horizontally with acceleration a. A small air bubble inside it is found to be stuck at 1 cm from vertical axis. Neglect surface tension. What is the acceleration of the tube.
A bent arc shaped sealed glass tube filled with water is accelerated horizontally with acceleration a. A small air bubble inside it is found to be stuck at 1 cm from vertical axis. Neglect surface tension. What is the acceleration of the tube.
physics-General
physics-
A rectangular block is slowly pushed face-down into a liquid. The block has height d. The cross-sectional area of the block A = 5cm2 The figure shows the apparent weight (Wapp ) of the block as a function of depth h of its lower face, then the density of liquid is (g=10m/s2 )
A rectangular block is slowly pushed face-down into a liquid. The block has height d. The cross-sectional area of the block A = 5cm2 The figure shows the apparent weight (Wapp ) of the block as a function of depth h of its lower face, then the density of liquid is (g=10m/s2 )
physics-General
physics-
The figure below shows four situations in which a gray liquid and a black liquid (which we known nothing about) are in a U tube.
In which of the following situation(s) of static equilibrium must the density of the gray liquid be greater than the density of the black liquid? (circle all appropriate cases)
The figure below shows four situations in which a gray liquid and a black liquid (which we known nothing about) are in a U tube.
In which of the following situation(s) of static equilibrium must the density of the gray liquid be greater than the density of the black liquid? (circle all appropriate cases)
physics-General
physics-
The figure below shows four situations in which a gray liquid and a black liquid (which we known nothing about) are in a U tube.
Which of the following situations does not show static equilibrium of liquids.
The figure below shows four situations in which a gray liquid and a black liquid (which we known nothing about) are in a U tube.
Which of the following situations does not show static equilibrium of liquids.
physics-General
physics-
A cylindrical block of density d stays fully immersed in a beaker filled with two immiscible liquids of different densities d1 and d2 . The block is in equilibrium with half of it in liquid 1 and the other half in liquid 2, as shown in the figure. If the block is given a small displacement downward and released, then neglecting frictional losses
i) it executes simple harmonic motion
ii) its motion is periodic but not simple harmonic
iii) the frequency of oscillation is independent of the size of the cylinder
iv) the displacement of the centre of the cylinder is symmetric about its equilibrium position
A cylindrical block of density d stays fully immersed in a beaker filled with two immiscible liquids of different densities d1 and d2 . The block is in equilibrium with half of it in liquid 1 and the other half in liquid 2, as shown in the figure. If the block is given a small displacement downward and released, then neglecting frictional losses
i) it executes simple harmonic motion
ii) its motion is periodic but not simple harmonic
iii) the frequency of oscillation is independent of the size of the cylinder
iv) the displacement of the centre of the cylinder is symmetric about its equilibrium position
physics-General
physics-
An automobile horn has a frequency n The horn is sounded continuously as the automobile is driven in the straight line with a velocity v past a stationary observer. The shortest distance between the automobile and the observer is x0 Which graph shown the correct variation of frequency heard by the observer. (C is the velocity of sound in air)
. 
An automobile horn has a frequency n The horn is sounded continuously as the automobile is driven in the straight line with a velocity v past a stationary observer. The shortest distance between the automobile and the observer is x0 Which graph shown the correct variation of frequency heard by the observer. (C is the velocity of sound in air)
.
physics-General
physics-
S1 & S2 are two coherent sources of sound having no initial phase difference. The velocity of sound is 330 m/s. No minima will be formed on the line passing through S2 and perpendicular to the line joining S1 and S2 , if the frequency of both the sources is:
S1 & S2 are two coherent sources of sound having no initial phase difference. The velocity of sound is 330 m/s. No minima will be formed on the line passing through S2 and perpendicular to the line joining S1 and S2 , if the frequency of both the sources is:
physics-General
physics-
Suppose that the compressions and reflections during propagation of a longitudinal sound wave in air 
constant. (Allgundergo a process which is neither isothermal nor adiabatic but obeys the law. symbols have their usual meanings with g = Cp /Cv ). the speed of the wave in terms of air temperature would be
Suppose that the compressions and reflections during propagation of a longitudinal sound wave in air constant. (Allgundergo a process which is neither isothermal nor adiabatic but obeys the law. symbols have their usual meanings with g = Cp /Cv ). the speed of the wave in terms of air temperature would be
physics-General
