Quantrex Quantrex AcademyJEE · NEET · NDA PYQs with solutions Open app
BITSAT2012PhysicsMagnetic Effects of CurrentActual

Magnetic moment of bar magnet is M . The work done to turn the magnet by 90^ of magnet in direction of magnetic field B will be

Options

  1. Azero
  2. B1 2 MB
  3. C2 MB
  4. DMB

Correct answer

D. MB

Step-by-step solution

Work done, W = MB (1- ) =90^ W = MB

Practice Magnetic Effects of Current on Quantrex Academy →

More from Magnetic Effects of Current

The straight wire A B carries a current I . The ends of the wire subtend angles ₁ and ₂ at the point P as shown in figure. The magnetic field at the point P is 2024A long straight wire of radius a carries a steady current 1 . The current is uniformly distributed across its cross section. The ratio of the magnetic field at a 2 and 2a from axis 2024The electrostatic force ( F ₁ ) and magnetic force ( F ₂ ) acting on a charge q moving with velocity v can be written: 2024The magnetic moments associated with two closely wound circular coils A and B of radius r_A=10 ~cm and r_B=20 ~cm respectively are equal if: (Where N _A, I _A and N _ B , I _ B are 2023A solenoid of 1200 turns is wound uniformly in a single layer on a glass tube 2 ~m long and 0.2 ~m in diameter. The magnetic intensity at the center of the solenoid when a current 2023A charge particle is moving in a uniform magnetic field (2 i +3 j ) T . If it has an acceleration of ( i -4 j ) m / s ^2 , then the value of will be : 2023The magnetic moment of an electron (e) revolving in an orbit around nucleus with an orbital angular momentum is given by: 2023A proton moving with a velocity 3 10⁵ ~m / s enters a magnetic field of 0.3 tesla at an angle of 30^ with the field. The radius of curvature of its path will be ( e / m for proton 2021 Full Magnetic Effects of Current list All BITSAT PYQs