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

Magnetics question

2025 · 2 Apr · Shift 2 · Q56
Guest · try one question or challengeGuest · try one question or challenge
  1. PYQ Library
  2. /JEE Main
  3. /Physics
  4. /Magnetics
  5. /2025 · 2 Apr · Shift 2 · Q56

Magnetics question

2025 · 2 Apr · Shift 2 · Q56

JEE MainPhysicsMagneticsMCQ+4 / −1
A solenoid having area A and length ' lll ' is filled with a material having relative permeability 2. The magnetic energy stored in the solenoid is :
  1. A
    B2 Al4μ0\frac{\mathrm{B}^2 \mathrm{~A} l}{4 \mu_0}4μ0​B2 Al​
  2. B
    B2 Al2μ0\frac{\mathrm{B}^2 \mathrm{~A} l}{2 \mu_0}2μ0​B2 Al​
  3. C
    B2 Alμ0\frac{\mathrm{B}^2 \mathrm{~A} l}{\mu_0}μ0​B2 Al​
  4. D
    B2Al\mathrm{B}^2 \mathrm{Al}B2Al
PreviousNext

More from Magnetics

  • A loop ABCDA , carrying current I=12 A, is placed in a plane, consists of two semi-circular segments of radius R1​=6π m and R2​=4π m. The magnitude of the resultant magnetic field… Includes diagram2025 · Numerical
  • A 4.0 cm long straight wire carrying a current of 8 A is placed perpendicular to a uniform magnetic field of strength 0.15 T . The magnetic force on the wire is ​ mN .2025 · Numerical
  • Given below are two statements: one is labelled as AssertionA and the other is labelled as Reason R Assertion A : If Oxygen ion (O−2) and Hydrogen ion (H+)…2025 · MCQ
  • If an optical medium possesses a relative permeability of π10​ and relative permittivity of 0.08851​, then the velocity of light is greater in vacuum than that in this medium by ​ times. (μ0​=4π×10−7H/m,ϵ0​=8.85×10−12 F/m,c=3×108 m/s)…2025 · Numerical
  • A particle of charge q, mass m and kinetic energy E enters in magnetic field perpendicular to its velocity and undergoes a circular arc of radius (r). Which of the following curves represents the variation of r with E ?2025 · MCQ
  • Uniform magnetic fields of different strengths (B1​ and B2​), both normal to the plane of the paper exist as shown in the figure. A charged particle of mass m and charge q, at the interface at an instant,… Includes diagram2025 · MCQ
  • Figure shows a current carrying square loop ABCD of edge length is ‘a’ lying in a plane. If the resistance of the ABC part is r and that of ADC part is 2r, then the magnitude of the resultant magnetic field at centre of the square loop is Includes diagram2025 · MCQ
  • An electron projected perpendicular to a uniform magnetic field B moves in a circle. If Bohr's quantization is applicable, then the radius of the electronic orbit in the first excited state is :2025 · MCQ