Physics-
General
Easy
Question
Two identical capacitors 1 and 2 are connected in series. The capacitor 2 contains a dielectric slab of constant K as shown. They are connected to a battery of emf V0 volts. The dielectric slab is then removed. Let Q1 and Q2 be the charge stored in the capacitors before removing the slab and Q1 and Q2 be the values after removing the slab. Then
Q 2 = ( K + 1 ) 2 
Q 2 = K + 1 2 K 
Q l = K 2
The correct answer is:
Related Questions to study
physics-
Which of the following is the most suitable arrangement for measuring the unknown resistance X which has resistance in the range 0 to 10
. Resistance of ammeter 1, resistance of voltmeter 10k
Which of the following is the most suitable arrangement for measuring the unknown resistance X which has resistance in the range 0 to 10. Resistance of ammeter 1, resistance of voltmeter 10k
physics-General
physics-
Three long conducting plate A, B & C having charges +q, –2q & +q as shown in figure. Here plate A and C are fixed. If the switch S is closed. The middle plate (B) will start moving in
Three long conducting plate A, B & C having charges +q, –2q & +q as shown in figure. Here plate A and C are fixed. If the switch S is closed. The middle plate (B) will start moving in
physics-General
physics-
Five identical parallel conducting plates each of area A have separation ‘d’ between successive surfaces. The plates are connected to the terminal of a battery as shown in the fig. The effective capacitance of the circuit is
Five identical parallel conducting plates each of area A have separation ‘d’ between successive surfaces. The plates are connected to the terminal of a battery as shown in the fig. The effective capacitance of the circuit is
physics-General
physics-
Some light bulbs are conected in parallel to a 120 V source as shown in the figure. Each bulb dissipates an average power of 60 W.The circuit has a fuse F that burns out when the current in the circuit exceeds 9 A. Determine the largest number of bulbs of the following, that can be used in the circuit without burning out the fuse
Some light bulbs are conected in parallel to a 120 V source as shown in the figure. Each bulb dissipates an average power of 60 W.The circuit has a fuse F that burns out when the current in the circuit exceeds 9 A. Determine the largest number of bulbs of the following, that can be used in the circuit without burning out the fuse
physics-General
physics-
In the circuit shown the variable resistance is so adjusted that the ammeter reading is same in both the position 1 and 2 of the key. The reading of ammeter is 2A. If E = 10 V, then x is
In the circuit shown the variable resistance is so adjusted that the ammeter reading is same in both the position 1 and 2 of the key. The reading of ammeter is 2A. If E = 10 V, then x is
physics-General
physics-
The circuit shown has an ideal ammeter with zero resistance and four identical light bulbs which are initially illuminated. A person removes the bulb R4 from its socket there by permanently breaking the electrical circuit at that point. Which statement(s) is/are true about the circuit after removing the bulb?
The circuit shown has an ideal ammeter with zero resistance and four identical light bulbs which are initially illuminated. A person removes the bulb R4 from its socket there by permanently breaking the electrical circuit at that point. Which statement(s) is/are true about the circuit after removing the bulb?
physics-General
physics-
For the circuit shown in the figure, potential difference 
is
For the circuit shown in the figure, potential difference is
physics-General
physics-
Five cells of emf’s 1V, 2V, 3V, 2V and 1V and having internal resistances 1,2,3,2 and 1 ohm respectively are connected as shown in figure
Five cells of emf’s 1V, 2V, 3V, 2V and 1V and having internal resistances 1,2,3,2 and 1 ohm respectively are connected as shown in figure
physics-General
physics-
A lead wire and an iron wire are connected in parallel. Their respective resistiuity are in the ratio 49 : 24. The lead wire carries 80% more current than the iron wire and the iron wire is 47% longer than the lead wire. The ratio of cross-sectional area of lead wire to that of the iron wire is
A lead wire and an iron wire are connected in parallel. Their respective resistiuity are in the ratio 49 : 24. The lead wire carries 80% more current than the iron wire and the iron wire is 47% longer than the lead wire. The ratio of cross-sectional area of lead wire to that of the iron wire is
physics-General
physics-
Two identical resistors with resistance R are connected in the two circuits drawn. The battery in both circuits is a 12 volt ideal battery. Which statement is correct?
Two identical resistors with resistance R are connected in the two circuits drawn. The battery in both circuits is a 12 volt ideal battery. Which statement is correct?
physics-General
physics-
The equivalent resistance between the terminal points A and B in the network shown in figure is
The equivalent resistance between the terminal points A and B in the network shown in figure is
physics-General
physics-
In the circuit shown, which of the following statements is correct?
In the circuit shown, which of the following statements is correct?
physics-General
physics-
A charge +2q moves vertically upwards with speed v, a second charge – q moves horizontally to the right with the same speed v, and a third charge + q moves horizontally to the right with the same speed v. The point P is located a perpendicular distance a away from each charge as shown in the figure. The magnetic field at point P is
A charge +2q moves vertically upwards with speed v, a second charge – q moves horizontally to the right with the same speed v, and a third charge + q moves horizontally to the right with the same speed v. The point P is located a perpendicular distance a away from each charge as shown in the figure. The magnetic field at point P is
physics-General
physics-
The coils C1 and C2 have same number of turns and carry equal currents in the same sense. They subtend the same angle q to P. If the magnetic field produced by C1 at P is B then that produced by C2 will be
The coils C1 and C2 have same number of turns and carry equal currents in the same sense. They subtend the same angle q to P. If the magnetic field produced by C1 at P is B then that produced by C2 will be
physics-General
physics-
After the switch shown in figure A is closed, there is current i through resistance R. Figure B indicates current variation curves a, b, c and d for four sets of values of R and capacitance C: (1) R0 and C0, (2) 2R0 and C0, (3) R0 and 2C0, (4) 2R0 and 2C0. Which set goes with which curve?
After the switch shown in figure A is closed, there is current i through resistance R. Figure B indicates current variation curves a, b, c and d for four sets of values of R and capacitance C: (1) R0 and C0, (2) 2R0 and C0, (3) R0 and 2C0, (4) 2R0 and 2C0. Which set goes with which curve?
physics-General
