Doubts
Sign in
12thPass logo
New chatPYQ LibraryDoubtsRank report
Sign in to see Recents
Sign in to save progress →
Doubts
Sign in

Electromagnetic Induction question

2022 · 25 Jul · Shift 2 · Q46
Guest · try one question or challengeGuest · try one question or challenge
  1. PYQ Library
  2. /JEE Main
  3. /Physics
  4. /Electromagnetic Induction
  5. /2022 · 25 Jul · Shift 2 · Q46

Electromagnetic Induction question

2022 · 25 Jul · Shift 2 · Q46

JEE MainPhysicsElectromagnetic InductionMCQ+4 / −1
The electric current in a circular coil of 2 turns produces a magnetic induction B1 at its centre. The coil is unwound and in rewound into a circular coil of 5 tuns and the same current produces a magnetic induction B2 at its centre. The ratio of B2B1{{{B_2}} \over {{B_1}}}B1​B2​​ is
  1. A
    52{5 \over 2}25​
  2. B
    254{25 \over 4}425​
  3. C
    54{5 \over 4}45​
  4. D
    252{25 \over 2}225​
PreviousNext

More from Electromagnetic Induction

  • Magnetic flux (in weber) in a closed circuit of resistance 20 Ω varies with time t(s) at ϕ= 8t2 − 9t + 5. The magnitude of the induced current at t = 0.25 s will be ​ mA.2022 · Numerical
  • The current in a coil of self inductance 2.0 H is increasing according to I = 2 sin(t2) A. The amount of energy spent during the period when current changes from 0 to 2 A is ​ J.2022 · Numerical
  • In a coil of resistance 8Ω, the magnetic flux due to an external magnetic field varies with time as ϕ=32​(9−t2). The value of total heat produced in the coil, till the flux becomes zero, will be ​J…2022 · Numerical
  • The magnetic flux through a coil perpendicular to its plane is varying according to the relation ϕ=(5t3+4t2+2t−5) Weber. If the resistance of the coil is 5 ohm, then the induced current through the coil at t = 2 s will…2022 · MCQ
  • A 10 Ω, 20 mH coil carrying constant current is connected to a battery of 20 V through a switch. Now after switch is opened current becomes zero in 100 μ s. The average e.m.f. induced in the coil is ​ V.2022 · Numerical
  • Two coils of self inductance L1 and L2 are connected in series combination having mutual inductance of the coils as M. The equivalent self inductance of the combination will be : Includes diagram2022 · MCQ
  • A metallic conductor of length 1 m rotates in a vertical plane parallel to east-west direction about one of its end with angular velocity 5 rad s − 1. If the horizontal component of earth's magnetic field is 0.2 × 10 − 4 T, then…2022 · MCQ
  • A conducting circular loop is placed in X−Y plane in presence of magnetic field B=(3t3j^​+3t2k^) in SI unit. If the radius of the loop is 1 m,…2022 · Numerical