Sign in
12thPass logo
New chatPYQ LibraryDoubtsRank report
Sign in to see Recents

Your guest activity stays on this device

Sign in to save progress →
Sign in

Electromagnetic Induction question

2022 · Q180
Guest · filters and generic practice availableBrowsing as a guest · PYQ filters and generic practice are available. Sign in only for personalised features and saved progress.
  1. PYQ Library
  2. /NEET
  3. /Physics
  4. /Electromagnetic Induction
  5. /2022 · Q180

Electromagnetic Induction question

2022 · Q180

NEETPhysicsElectromagnetic InductionMCQ+4 / −1

The magnetic flux linked to a circular coil of radius R is

ϕ=2t3+4t2+2t+5\phi = 2{t^3} + 4{t^2} + 2t + 5ϕ=2t3+4t2+2t+5 Wb

The magnitude of induced emf in the coil at t = 5 s is

  1. A
    192 V
  2. B
    108 V
  3. C
    197 V
  4. D
    150 V
View written solutionFree

Correct answer: A

Given magnetic flux is

$$\phi = 2{t^3} + 4{t^2} + 2t + 5$$

Induced emf is given by

$$\varepsilon = {{ - d\phi } \over {dt}} = {{ - d} \over {dt}}(2{t^3} + 4{t^2} + 2t + 5)$$

$$|\varepsilon | = 6{t^2} + 8t + 2$$

At $t = 5$ s,

$$|\varepsilon | = 6 \times 25 + 8 \times 5 + 2$$

$ = 150 + 40 + 2$

$ = 192$ V

PreviousNext

More from Electromagnetic Induction

  • A square loop of side 1 m and resistance 1 Ω is placed in a magnetic field of 0.5 T. If the plane of loop is perpendicular to the direction of magnetic field, the magnetic flux through the loop is2022 · MCQ
  • Two conducting circular loops of radii R1 and R2 are placed in the same plane with their centres coinciding. If R1 >> R2, the mutual inductance M between them will be directly proportional to :2021 · MCQ
  • In which of the following devices, the eddy current effect is not used?2019 · MCQ
  • A 800 turn coil of effective area 0.05 m2 is kept. perpendicular to a magnetic filed 5 × 10–5 T. When the plane of the coil is rotated by 90o around any of its coplanar axis in 0.1 s, the emf induced in the coil will be :2019 · MCQ
  • A long solenoid of diameter 0.1 m has 2 × 104 turns per meter. At the centre of the solenoid, a coil of 100 turns and radius 0.01 m is placed with its axis coinciding with the solenoid axis. The current in the solenoid reduces at…2017 · MCQ
  • A long solenoid has 1000 turns. When a current of 4 A flows through it, the magnetic flux linked with each turn of the solenoid is 4 ×10−3 Wb. The self-inductance of the solenoid is2016 · MCQ
  • A uniform magnetic field is restricted within a region of rafius r. The magnetic field changes with time at a rate dtdB​. Loop 1 of radius R > r encloses the region r and loop 2 of radius R is outside… Includes diagram2016 · MCQ
  • An electron moves on a straight line path XY as shown. The abcd is a coil adjacent to the path of electron. What will be the direction of current, if any, induced in the coil ? Includes diagram2015 · MCQ