Current Electricity
182 previous year questions.
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Chapter Questions 182 MCQs
The ratio of the equivalent resistance of the network (shown in figure) between the points a and b when switch is open and switch is closed is x : 8. The value of x is _________. 
The voltage drop across resistance in the given figure will be V. 
Calculate the amount of charge on capacitor of 4 F. The internal resistance of battery is 1 : 
The equivalent resistance of the given circuit between the terminals A and B is : 
In the given figure, the emf of the cell is 2.2 V and if internal resistance is 0.6 . Calculate the power dissipated in the whole circuit : 
The colour coding on a carbon resistor is shown in the given figure. The resistance value of the given resistor is : 
A current of 6 A enters one corner P of an equilateral triangle PQR having 3 wires of resistance 2 each and leaves by the corner R. The currents in ampere is ________ . 
In the given potentiometer circuit, for key K₁ closed, null point is at J₁. For K₂ closed, null point is at J₂. The value of is , where a= _________ . (Note: Using standard balancing lengths and typically provided in this diagram, e.g., m, m).
In the given figure, there is a circuit of potentiometer of length AB = 10 m. The resistance per unit length is 0.1 per cm. Across AB, a battery of emf E and internal resistance 'r' is connected. The maximum value of emf measured by this potentiometer is : 
A cell of emf 6 V and internal resistance 2 Ω is connected with another cell of emf 4 V and internal resistance 8 Ω (as shown in the figure). The potential difference across points X and Y is : 
The voltage across the 10 Ω resistor in the given circuit is x volt. The value of 'x' to the nearest integer is ________. [Note: Assuming a standard circuit where a 10V source is connected to a 10 resistor in a series-parallel combination yielding 70/10 or similar common JEE configurations] 
A capacitor of capacitance C=1 F is suddenly connected to a battery of 100 volt through a resistor R = 100 . The time taken for the capacitor to be charged to get 50 V is: [Take ln 2 = 0.69] 
In the given figure, a battery of emf E is connected across a conductor PQ of length 'l' and different area of cross-sections having radii and . Choose the correct option as one moves from P to Q : 
For the circuit shown, the value of current at time t=3.2 s will be ________ A. 
Consider a 72 cm long wire AB as shown in the figure. The galvanometer jockey is placed at P on AB at a distance x cm from A. The galvanometer shows zero deflection. The value of x, to the nearest integer, is ________. 
The current in the given circuit will be
A 8 V Zener diode along with a series resistance R is connected across a 20 V supply (as shown in the figure). If the maximum Zener current is 25 mA, then the minimum value of R will be ____ Ω.
A meter bridge setup is shown in the figure. It is used to determine an unknown resistance R using a given resistor of 15 Ω. The galvanometer (G) shows null deflection when tapping key is at 43 cm mark from end A. If the end correction for end A is 2 cm, then the determined value of R will be ___ Ω.
Current measured by the ammeter Ⓐ in the reported circuit when no current flows through 10 Ω resistance, will be ___ A.
The current density in a cylindrical wire of radius mm is . The current through the outer portion of the wire between radial distances and is ; where is _________.
A wire X of length 50 cm carrying a current of 2 A is placed parallel to a long wire Y of length 5 m. The wire Y carries a current of 3 A. The distance between two wires is 5 cm and currents flow in the same direction. The force acting on the wire Y is
In a potentiometer arrangement, a cell of emf gives a balance point at length of wire This cell is now replaced by another cell of emf . The difference in balancing length of potentiometer wire in above conditions will be _______
25
625
Equivalent resistance between the adjacent corners of a regular -sided polygon of uniform wire of resistance would be :
Given below are two statements : One is labelled as Assertion and the other is labelled as Reason R
Assertion A : For measuring the potential difference across a resistance of , the voltmeter with resistance will be preferred over voltmeter with resistance .
Reason R : Voltmeter with higher resistance will draw smaller current than voltmeter with lower resistance.
In the light of the above statements, choose the most appropriate answer from the options given below
Both and are correct but is not the correct explanation of
Both and are correct and is the correct explanation of
A is not correct but is correct
A is correct but is not correct
Two identical cells, when connected either in parallel or in series gives same current in an external resistance The internal resistance of each cell will be__
For the given circuit, in the steady state, ___ 
In the given circuit, the value of is ___.
Assertion A: An electric fan continues to rotate for some time after the current is switched off.
Reason R: Fan continuous to rotate due to inertia of motion.
In the light of above statements, choose the most appropriate answer from the options given below.
(A) directly proportional to the length of the potentiometer wire
(B) directly proportional to the potential gradient of the wire
(C) inversely proportional to the potential gradient of the wire
(D) inversely proportional to the length of the potentiometer wire
Choose the correct option for the above statements:
Assertion A : If an electric dipole of dipole moment 30 x 10-5 Cm is enclosed by a closed surface, the net flux coming out of the surface will by zero.
Reason R : Electric dipole consists of two equal and opposite charges.
In the light of above, statements, choose the correct answer from the options given below:
Find the magnetic field in S.I units, at point
Choose the correct answer from the options given below:
The equivalent resistance of the circuit and the current supplied by the battery are respectively:
The voltage across a 5Ω resistor is given as V = 200 sin(100πt). Find out the time required for current through io it to change from to i0 [ i0 is peak current]
s
s
s
s
Given below are two statements. One is labelled as Assertion (A) and the other is labelled as Reason (R):
Assertion (A): In an insulated container, a gas is adiabatically shrunk to half of its initial volume. The temperature of the gas decreases.
Reason (R): Free expansion of an ideal gas is an irreversible and an adiabatic process.
In the light of the above statements, choose the correct answer from the options given below:
For the circuit shown above, the equivalent gate is:
Find the equivalent resistance between two ends of the following circuit:
The circuit consists of three resistors, two of in series connected in parallel with another resistor of .
Current passing through a wire as function of time is given as . The charge that will flow through the wire from to is:
Given below are two statements. One is labelled as Assertion (A) and the other is labelled as Reason (R):
Assertion (A): In an insulated container, a gas is adiabatically shrunk to half of its initial volume. The temperature of the gas decreases.
Reason (R): Free expansion of an ideal gas is an irreversible and an adiabatic process. \text{In the light of the above statements, choose the correct answer from the options given below:}
Two cells of emf 1V and 2V and internal resistance 2 and 1 , respectively, are connected in series with an external resistance of 6 . The total current in the circuit is . Now the same two cells in parallel configuration are connected to the same external resistance. In this case, the total current drawn is . The value of is . The value of x is 1cm.
In the figure shown below, a resistance of 150.4 is connected in series to an ammeter A of resistance 240 . A shunt resistance of 10 is connected in parallel with the ammeter. The reading of the ammeter is ______ mA.
In the provided circuit, the input voltage is , a series resistor is connected, and the circuit then branches into two parallel paths: one with a resistor in series with a Zener diode, and another with the LED.
A Wheatstone bridge is initially at room temperature and all arms of the bridge have same value of resistances When resistance is heated, its resistance value increases by . The potential difference after is heated is _______ V. 
An infinitely long straight wire carrying current is bent in a planar shape as shown in the diagram. The radius of the circular part is . The magnetic field at the centre of the circular loop is :
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In the circuit shown below, find the voltage across the capacitor in steady state.
For the circuit shown below, find current across . 
Correct option for the circuit shown is: 
The heat generated in 1 minute between points A and B in the given circuit, when a battery of 9 V with internal resistance of 1 is connected across these points is ______ J. 
An object is projected with kinetic energy K from point A at an angle 60° with the horizontal. The ratio of the difference in kinetic energies at points B and C to that at point A (see figure), in the absence of air friction is : 
The space between the plates of a parallel plate capacitor of capacitance C (without any dielectric) is now filled with three dielectric slabs of dielectric constants , and (as shown in figure). If new capacitance is n/3 C then the value of n is_______. 
The following diagram shows a Zener diode as a voltage regulator. The Zener diode is rated at V and the desired current in load is 5 mA. The unregulated voltage source can supply up to 25 V. Considering the Zener diode can withstand four times of the load current, the value of resistor (shown in circuit) should be_______ .
The equivalent resistance between the points and in the given circuit is Find the value of . 
If equivalent resistance between points A and B is (in ), then find value of X: 
Figure shows two combinations of real cells with 6 internal resistance. If reading of ammeters are same in both cases, find the value of 'r'. 
If the galvanometer shows zero deflection for the jockey’s contact point , find the length .
For the given circuit, if R = 12 , balancing length is 180 cm. When value of R is 4 , then balancing length is 120 cm. Find internal resistance of cell E. 