Current Electricity PYQs - Last 10 Years

JEE Main / Physics / Electricity / 327 recent questions

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Practice 327 JEE Main Physics questions from Current Electricity. Use the year-wise and type-wise breakdown to prioritize recent PYQs, then continue into the question list below.

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Last 10 Years Current Electricity Questions

Showing 50 of 327 filtered questions.

1Current Electricity

The resistance of a conductor at 15\(^\circ\)C is 16\(\Omega\) and at 100\(^\circ\)C is 20\(\Omega\). What will be the temperature coefficient of resistance of the conductor?

2Current Electricity

First, a set of n equal resistors of 10 \(\Omega\) each are connected in series to a battery of emf 20V and internal resistance 10\(\Omega\). A current I is observed to flow. Then, the n resistors are connected in parallel to the same batte...

INTEGER+4 / -12021

3Current Electricity

Five identical cells each of internal resistance 1\(\Omega\) and emf 5V are connected in series and in parallel with an external resistance 'R'. For what value of 'R', current in series and parallel combination will remain the same?

4Current Electricity

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 ___________.

INTEGER+4 / -12021

5Current Electricity

For full scale deflection of total 50 divisions, 50 mV voltage is required in galvanometer. The resistance of galvanometer if its current sensitivity is 2 div/mA will be :

6Current Electricity

The Colour coding on a carbon resistor is shown in the given figure. The resistance value of the given resistor is :

7Current Electricity

In an electrical circuit, a battery is connected to pass 20C of charge through it in a certain given time. The potential difference between two plates of the battery is maintained at 15V. The workdone by the battery is __________J.

INTEGER+4 / -12021

8Current Electricity

Five equal resistances are connected in a network as shown in figure. The net resistance between the points A and B is :

9Current Electricity

A wire of 1\(\Omega\) has a length of 1 m. It is stretched till its length increases by 25%. The percentage change in resistance to the nearest integer is :

10Current Electricity

What equal length of an iron wire and a copper-nickel alloy wire, each of 2 mm diameter connected parallel to give an equivalent resistance of 3\(\Omega\) ?(Given resistivities of iron and copper-nickel alloy wire are 12 \(\mu\)\(\Omega\) a...

11Current Electricity

In the given figure, the emf of the cell is 2.2 V and if internal resistance is 0.6\(\Omega\). Calculate the power dissipated in the whole circuit :

12Current Electricity

An electric bulb of 500 watt at 100 volt is used in a circuit having a 200 V supply. Calculate the resistance R to be connected in series with the bulb so that the power delivered by the bulb is 500 W.

13Current Electricity

If you are provided a set of resistances 2\(\Omega\), 4\(\Omega\), 6\(\Omega\) and 8\(\Omega\). Connect these resistances so as to obtain an equivalent resistance of \({{46} \over 3}\)\(\Omega\).

14Current Electricity

An electric bulb rated as 200 W at 100 V is used in a circuit having 200 V supply. The resistance 'R' that must be put in series with the bulb so that the bulb delivers the same power is _____________ \(\Omega\).

INTEGER+4 / -12021

15Current Electricity

In the given figure, there is a circuit of potentiometer of length AB = 10 m. The resistance per unit length is 0.1 \(\Omega\) per cm. Across AB, a battery of emf E and internal resistance 'r' is connected. The maximum value of emf measured...

16Current Electricity

A 16 \(\Omega\) wire is bend to form a square loop. A 9V supply having internal resistance of 1\(\Omega\) is connected across one of its sides. The potential drop across the diagonals of the square loop is _______________ \(\times\) 10\(-\)...

INTEGER+4 / -12021

17Current Electricity

The given potentiometer has its wire of resistance 10\(\Omega\). When the sliding contact is in the middle of the potentiometer wire, the potential drop across 2\(\Omega\) resistor is :

18Current Electricity

In the given potentiometer circuit arrangement, the balancing length AC is measured to be 250 cm. When the galvanometer connection is shifted from point (1) to point (2) in the given diagram, the balancing length becomes 400 cm. The ratio o...

19Current Electricity

In the given circuit of potentiometer, the potential difference E across AB (10 m length) is larger than E1 and E2 as well. For key K1 (closed), the jockey is adjusted to touch the wire at point J1 so that there is no deflection in the galv...

INTEGER+4 / -12021

20Current Electricity

A current of 6A enters one corner P of an equilateral triangle PQR having 3 wires of resistance 2\(\Omega\) each and leaves by the corner R. The currents i1 in ampere is _________.

INTEGER+4 / -12021

21Current Electricity

A current through a wire depends on time as i = \(\alpha\)0t + \(\beta\)t2where \(\alpha\)0 = 20 A/s and \(\beta\) = 8 As\(-\)2. Find the charge crossed through a section of the wire in 15 s.

22Current Electricity

A cell E1 of emf 6V and internal resistance 2\(\Omega\) is connected with another cell E2 of emf 4V and internal resistance 8\(\Omega\) (as shown in the figure). The potential difference across points X and Y is :

23Current Electricity

A cylindrical wire of radius 0.5 mm and conductivity 5 \(\times\) 107 S/m is subjected to an electric field of 10 mV/m. The expected value of current in the wire will be x3\(\pi\) mA. The value of x is _________.

INTEGER+4 / -12021

24Current Electricity

In an electric circuit, a cell of certain emf provides a potential difference of 1.25 V across a load resistance of 5\(\Omega\). However, it provides a potential difference of 1 V across a load resistance of 2\(\Omega\). The emf of the cell...

INTEGER+4 / -12021

25Current Electricity

A Copper (Cu) rod of length 25 cm and cross-sectional area 3 mm2 is joined with a similar Aluminium (Al) rod as shown in figure. Find the resistance of the combination between the ends A and B.(Take Resistivity of Copper = 1.7 \(\times\) 10...

26Current Electricity

A current of 5 A is passing through a non-linear magnesium wire of cross-section 0.04 m2. At every point the direction of current density is at an angle of 60\(^\circ\) with the unit vector of area of cross-section. The magnitude of electri...

27Current Electricity

The value of current in the 6 \(\Omega\) resistance is :

28Current Electricity

In the given figure switches S1 and S2 are in open condition. The resistance across ab when the switches S1 and S2 are closed is _____________ \(\Omega\).

INTEGER+4 / -12021

29Current Electricity

A uniform heating wire of resistance 36\(\Omega\) is connected across a potential difference of 240 V. The wire is then cut into half and potential difference of 240V is applied across each half separately. The ratio of power dissipation in...

INTEGER+4 / -12021

30Current Electricity

Two resistors R1 = (4 \(\pm\) 0.8) \(\Omega\) and R2 = (4 \(\pm\) 0.4) \(\Omega\) are connected in parallel. The equivalent resistance of their parallel combination will be :

31Current Electricity

Due to cold weather a 1 m water pipe of cross-sectional area 1 cm2 is filled with ice at \(-\)10\(^\circ\)C. Resistive heating is used to melt the ice. Current of 0.5A is passed through 4 k\(\Omega\) resistance. Assuming that all the heat p...

32Current Electricity

The voltage across the 10\(\Omega\) resistor in the given circuit is x volt.The value of 'x' to the nearest integer is _________.

INTEGER+4 / -12021

33Current Electricity

In the experiment of Ohm's law, a potential difference of 5.0 V is applied across the end of a conductor of length 10.0 cm and diameter of 5.00 mm. The measured current in the conductor is 2.00 A. The maximum permissible percentage error in...

34Current Electricity

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 ___________.

INTEGER+4 / -12021

35Current Electricity

Two wires of same length and thickness having specific resistances 6\(\Omega\) cm and 3\(\Omega\) cm respectively are connected in parallel. The effective resistivity is \(\rho\)\(\Omega\) cm. The value of \(\rho\), to the nearest integer, ...

INTEGER+4 / -12021

36Current Electricity

A current of 10A exists in a wire of cross-sectional area of 5 mm2 with a drift velocity of 2 \(\times\) 10\(-\)3 ms\(-\)1. The number of free electrons in each cubic meter of the wire is ___________.

37Current Electricity

The equivalent resistance of series combination of two resistors is 's'. When they are connected in parallel, the equivalent resistance is 'p'. If s = np, then the minimum value for n is ____________. (Round off to the Nearest Integer)

INTEGER+4 / -12021

38Current Electricity

Two cells of emf 2E and E with internal resistance r1 and r2 respectively are connected in series to an external resistor R (see figure). The value of R, at which the potential difference across the terminals of the first cell becomes zero ...

39Current Electricity

The four arms of a Wheatstone bridge have resistances as shown in the figure. A galvanometer of 15\(\Omega\) resistance is connected across BD. Calculate the current through the galvanometer when a potential difference of 10V is maintained ...

40Current Electricity

A conducting wire of length 'l', area of cross-section A and electric resistivity \(\rho\) is connected between the terminals of a battery. A potential difference V is developed between its ends, causing an electric current.If the length of...

41Current Electricity

In the figure given, the electric current flowing through the 5 k\(\Omega\) resistor is 'x' mA.The value of x to the nearest integer is ____________.

INTEGER+4 / -12021

42Current Electricity

A resistor develops 500 J of thermal energy in 20 s when a current of 1.5A is passed through it. If the current is increased from 1.5A to 3A, what will be the energy developed in 20 s.

43Current Electricity

The energy dissipated by a resistor is 10 mJ in 1 s when an electric current of 2 mA flows through it. The resistance is ___________\(\Omega\). (Round off to the Nearest Integer)

INTEGER+4 / -12021

44Current Electricity

In the given circuit diagram, a wire is joining
points B and D. The current in this wire is :

45Current Electricity

In a meter bridge experiment S is a standard
resistance. R is a resistance wire. It is found
that balancing length is \(l\) = 25 cm. If R is
replaced by a wire of half length and half
diameter that of R of same material, then the
balancing ...

INTEGER+4 / -02020

46Current Electricity

The length of a potentiometer wire is 1200 cm
and it carries a current of 60 mA. For a cell of
emf 5V and internal resistance of 20\(\Omega\), the null
point on it is found to be a 1000 cm. The
resistance of whole wire is :

47Current Electricity

Four resistances of 15\(\Omega\), 12\(\Omega\), 4\(\Omega\) and 10\(\Omega\)
respectively in cyclic order to form
Wheatstone's network. The resistance that
is to be connected in parallel with the
resistance of 10\(\Omega\) to balance t...

INTEGER+4 / -02020

48Current Electricity

A galvanometer having a coil resistance
100 \(\Omega\) gives a full scale deflection when a
current of 1 mA is passed through it. What is
the value of the resistance which can convert
this galvanometer into a voltmeter giving full
scale de...

49Current Electricity

The series combination of two batteries, both
of the same emf 10 V, but different internal
resistance of 20\(\Omega\) and 5\(\Omega\), is connected to the
parallel combination of two resistors 30\(\Omega\) and
R \(\Omega\). The voltage ...

INTEGER+4 / -02020

50Current Electricity

The current I1 (in A) flowing through 1 \(\Omega\) resistor in the following circuit is :