Electromagnetic Induction PYQs - Last 10 Years

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Practice 25 COMEDK Physics questions from Electromagnetic Induction. 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 Electromagnetic Induction Questions

Showing 25 of 25 filtered questions.

1Electromagnetic Induction

A circular coil of radius 7 cm and 40 turns is rotated about its vertical diameter with an angular speed of 40 radians per second in a uniform horizontal magnetic field of $4 \times 10^{-2} T$. What is the maximum current induced in the coi...

2Electromagnetic Induction

A square loop of wire 2.2 cm on each side contains 2 turns and has a total resistance of $0.0002 \Omega$. It is located 22 cm from a long straight current carrying wire. If the current in the straight wire is increased at a steady rate from...

3Electromagnetic Induction

A metallic circular loop is placed with its plane perpendicular to a uniform magnetic field of 0.3 T . If the radius of the loop decreases at a constant rate of $2 \mathrm{~mm} \mathrm{~s}^{-1}$, what will be the induced emf in the loop, wh...

4Electromagnetic Induction

When a current of 2.5 A passes through the primary coil of a transformer of 200 number turns, the magnetic flux linked with the secondary coil having 400 turns is $600 \times 10^{-6} \mathrm{~T} \mathrm{~m}^2$. Find the induced emf in the s...

5Electromagnetic Induction

The magnetic flux $\phi$ through a stationary loop of wire having a resistance R varies with time as $\phi=4 t^2+3 t$. The average emf and total charge flowing in the loop in the time interval $t=0$ to $t=\tau$ respectively are

6Electromagnetic Induction

A rectangular coil of 250 turns has an average area of $20 \mathrm{~cm} \times 15 \mathrm{~cm}$. The coil rotates with a speed of 60 cycles per second in a uniform magnetic field of $2 \times 10^{-2} \mathrm{~T}$ about an axis perpendicular...

7Electromagnetic Induction

A current of 2 A is passed through the primary coil. The total flux linked with the secondary coil, which is closely wound over the primary is $2000 \times 10^{-6}$ weber. What is the induced emf in the secondary if the current through the ...

8Electromagnetic Induction

A circular coil of area $2 \sqrt{2} \mathrm{~cm}^2$ and resistance $2 \boldsymbol{\Omega}$ is arranged vertically in the east -west direction. A uniform magnetic field 0.2 T is set up across the plane in the north to east direction. Now the...

9Electromagnetic Induction

A metallic rod of \(2 \mathrm{~m}\) length is rotated with a frequency \(100 \mathrm{~Hz}\) about an axis passing through the centre of the circular ring of radius \(2 \mathrm{~m}\). A constant magnetic field \(2 \mathrm{~T}\) is applied pa...

10Electromagnetic Induction

Around the central part of an air cored solenoid of length \(20 \mathrm{~cm}\) and area of cross section \(1.4 \times 10^{-3} \mathrm{~m}^2\) and 3000 turns, another coil of 250 turns is closely wound. A current \(2 \mathrm{~A}\) in the sol...

11Electromagnetic Induction

Select the unit of the coefficient of mutual induction from the following.

12Electromagnetic Induction

The current in a coil changes steadily from \(3 \mathrm{~A}\) to \(5 \mathrm{~A}\) in \(0.2 \mathrm{~s}\) when an emf of \(2 \mu \mathrm{V}\) is induced in it. The self-inductance of the coil is

13Electromagnetic Induction

The magnetic flux linked with a coil is given by the equation: \(\phi=8 t^2+t+10\). The e.m.f. induced in the coil in the \(3^{\text {rd }}\) second will be

14Electromagnetic Induction

A transformer of \(100 \%\) efficiency has 200 turns in the primary and 40000 turns in the secondary. It is connected to a \(220 \mathrm{~V}\) main supply and secondary feeds to a \(100 \mathrm{~K} \Omega\) resistance. The potential differe...

15Electromagnetic Induction

A conducting circular loop is placed in a uniform magnetic field \(\mathrm{B}=0.125 \mathrm{~T}\) with its plane perpendicular to the loop. If the radius of the loop is made to shrink at a constant rate of $$2 \mathrm{~mm} \mathrm{~s}^{-1}$...

16Electromagnetic Induction

A metallic rod of length '\(a\)' is rotated with an angular frequency of \(0.2 \mathrm{~rads}^{-1}\) about an axis normal to the rod passing through its one end. A constant and uniform magnetic field of '\(\mathrm{B}\)' T parallel to the ax...

17Electromagnetic Induction

A wire ' 1 ' \(\mathrm{cm}\) long bent into a circular loop is placed perpendicular to the magnetic field of flux density '\(B^{\prime} W b \mathrm{~m}^{-2}\). Within \(0.1 \mathrm{sec}\), the loop is changed into a square of side '\(a\)' $...

18Electromagnetic Induction

In an inductor of self-inductance \(2 \mathrm{~mH}\), current changes with time (in sec) according to the relation, \(I=(3 t^2-3 t+8) A\). The emf becomes zero at

19Electromagnetic Induction

One volt induced emf is produced in the secondary coil when the current through the primary coil is changed from \(3 \mathrm{~A}\) to \(1 \mathrm{~A}\) in 100 milliseconds. the mutual inductance of the two coil is:

20Electromagnetic Induction

The magnetic flux linked with a coil satisfies the relation \(\phi=\left(4 t^2+6 t+9\right) \mathrm{Wb}\), where \(t\) is time in second. The emf induced in the coil at \(t=2 \mathrm{~s}\) is

21Electromagnetic Induction

A circular coil of 20 turns and radius 10 cm is placed in a uniform magnetic field of 0.10 T normal to the plane of the coil. If the current in the coil is 5 A, then the average force on each electron in the coil due to the magnetic field i...

22Electromagnetic Induction

Television frequencies are of the order of 100 MHz, while radio frequencies are of the order of 1 MHz. Using these as typical frequencies, the ratio of the emf generated in a loop antenna by a television wave to that generated by a radio wa...

23Electromagnetic Induction

In step-up transformer, relation between number of turns in primary (N\(_P\)) and number of turns in secondary (N\(_S\)) coils is

24Electromagnetic Induction

A coil of 100 turns carries a current of 5 mA and
creates a magnetic flux of 10\(^{-5}\) Wb. The
inductance is

25Electromagnetic Induction

A coil of wire of a certain radius has 100 turns
and a self inductance of 15 mH. The self
inductance of a second similar coil of 500 turns
will be