Physics-
General
Easy
Question
In the circuit shown, when the key k is pressed at time t = 0, which of the following statements about current I in the resistor AB is true
- I = 2mA at all t
- I oscillates between 1 mA and 2mA
- I = 1 mA at all t
- At t = 0, I = 2mA and with time it goes to 1 mA
The correct answer is: At t = 0, I = 2mA and with time it goes to 1 mA
Related Questions to study
physics-
Find heat produced in the capacitors on closing the switch S
Find heat produced in the capacitors on closing the switch S
physics-General
physics-
In the circuit shown in figure C1=2C2. Switch S is closed at time t=0. Let i1 and i2 be the currents flowing through C1 and C2 at any time t, then the ratio i1 / i2
In the circuit shown in figure C1=2C2. Switch S is closed at time t=0. Let i1 and i2 be the currents flowing through C1 and C2 at any time t, then the ratio i1 / i2
physics-General
physics-
In the transient shown the time constant of the circuit is :
In the transient shown the time constant of the circuit is :
physics-General
physics-
A capacitor C = 100 mF is connected to three resistors each of resistance 1 kW and a battery of emf 9V. The switch S has been closed for long time so as to charge the capacitor. When switch S is opened, the capacitor discharges with time constant
A capacitor C = 100 mF is connected to three resistors each of resistance 1 kW and a battery of emf 9V. The switch S has been closed for long time so as to charge the capacitor. When switch S is opened, the capacitor discharges with time constant
physics-General
physics-
A capacitor C = 100 
is connected to three resistor each of resistance 1 
and a battery of emf 9V. The switch S has been closed for long time so as to charge the capacitor. When switch S is opened, the capacitor discharges with time constant
A capacitor C = 100 is connected to three resistor each of resistance 1 and a battery of emf 9V. The switch S has been closed for long time so as to charge the capacitor. When switch S is opened, the capacitor discharges with time constant
physics-General
physics-
A charged capacitor is allowed to discharge through a resistance 
by closing the switch S at the instant t = 0. At time t = ln 2 
, the reading of the ammeter falls half of its initial value. The resistance of the ammeter equal to
A charged capacitor is allowed to discharge through a resistance by closing the switch S at the instant t = 0. At time t = ln 2 , the reading of the ammeter falls half of its initial value. The resistance of the ammeter equal to
physics-General
physics-
Find equivalent capacitance across AB (all capacitances in )
Find equivalent capacitance across AB (all capacitances in )
physics-General
physics-
The diagram shows four capacitors with capacitances and break down voltages as mentioned. What should be the maximum value of the external emf source such that no capacitor breaks down?[Hint: First of all find out the break down voltages of each branch. After that compare them.]
The diagram shows four capacitors with capacitances and break down voltages as mentioned. What should be the maximum value of the external emf source such that no capacitor breaks down?[Hint: First of all find out the break down voltages of each branch. After that compare them.]
physics-General
physics-
Find the equivalent capacitance across A & B
Find the equivalent capacitance across A & B
physics-General
physics-
In the circuit shown, a potential difference of 60V is applied across AB. The potential difference between the point M and N is
In the circuit shown, a potential difference of 60V is applied across AB. The potential difference between the point M and N is
physics-General
physics-
In the circuit shown in figure, the ratio of charges on 5 and 4 capacitor is
In the circuit shown in figure, the ratio of charges on 5 and 4 capacitor is
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 C1 and C2 respectively. The ratio C1/C2 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 C1 and C2 respectively. The ratio C1/C2 is
physics-General
physics-
Two capacitor having capacitances 8 and 16 have breaking voltages 20 V and 80 V. They are combined in series. The maximum charge they can store individually in the combination is
Two capacitor having capacitances 8 and 16 have breaking voltages 20 V and 80 V. They are combined in series. The maximum charge they can store individually in the combination is
physics-General
physics-
What is the equivalent capacitance of the system of capacitors between A & B
What is the equivalent capacitance of the system of capacitors between A & B
physics-General
physics-
Four metallic plates arearranged as shown in the figure. If the distance between each plate then capacitance of the given system between points A and B is (Given d << A)
Four metallic plates arearranged as shown in the figure. If the distance between each plate then capacitance of the given system between points A and B is (Given d << A)
physics-General
