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

2012 · Q136
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. /2012 · Q136

Electromagnetic Induction question

2012 · Q136

NEETPhysicsElectromagnetic InductionMCQ+4 / −1
A coil of resistance 400 Ω\OmegaΩ is placed in a magnetic field. If the magnetic flux ϕ\phiϕ (Wb) linked with the coil varies with time t (sec) as ϕ=50t2+4\phi = 50{t^2} + 4ϕ=50t2+4.

The current in the coil at t = 2 sec is
  1. A
    0.5 A
  2. B
    0.1 A
  3. C
    2 A
  4. D
    1 A
View written solutionFree

Correct answer: A

According, to Faraday’s law of induction

Induced e.m.f, ε=−dϕdt\varepsilon = - {{d\phi } \over {dt}}ε=−dtdϕ​ = -(100t)

Induced current i at t = 2 sec.

= ∣εR∣=+100×2400\left| {{\varepsilon \over R}} \right| = + {{100 \times 2} \over {400}}​Rε​​=+400100×2​ = +0.5 A

PreviousNext

More from Electromagnetic Induction

  • The current i in a coil varies with time as shown in the figure. The variation of induced emf with time would be Includes diagram2011 · MCQ
  • A conducting circular loop is placed in a uniform magnetic field, B = 0.025 T with its plane perpendicular to the loop. The radius of the loop is made to shrink at a constant rate of 1 mm s−1. The induced emf when the radius is 2 cm, is2010 · MCQ
  • A rectangular, a square, a circular and an elliptical loop, all in the (x-y) plane, are moving out of a uniform magnetic field with a constant velocity. V=vi. The magnetic field is directed along the negative…2009 · MCQ
  • A conducting circular loop is placed in a uniform magnetic field 0.04 T with its plane perpendicular to the magnetic field. The radius of the loop starts shrinking at 2 mm/s. The induced emf in the loop when the radius is 2 cm is2009 · MCQ
  • A long solenoid has 500 turns. When a current of 2 ampere is passed through it, the resulting magnetic flux linked with each turn of the solenoid is 4 × 10−3 Wb. The self-inductance of the solenoid is2008 · MCQ
  • A circular disc of radius 0.2 meter is placed in a uniform magnetic field of induction π1​(m2Wb​) in such a way that its axis makes an angle of 60o with B. The magnetic flux…2008 · MCQ
  • Two coils of self inductance 2 mH and 8 mH are placed so close together that the effective flux in one coil is completely linked with the other. The mutual inductance between these coils is2006 · MCQ
  • As a result of change in the magnetic flux linked to the closed loop as shown in the figure, an e.m.f. V volt is induced in the loop. The work done (joule) in taking a charge Q coulomb once along the loop is Includes diagram2005 · MCQ