Quantrex Quantrex AcademyJEE · NEET · NDA PYQs with solutions Open app
JEE Main2003PhysicsMagnetic Properties of MatterActual

A magnetic needle lying parallel to a magnetic field requires W units of work to turn it through 60^ . The torque needed to maintain the needle in this position will be

Options

  1. A3 ~W
  2. BW
  3. C3 2 ~W
  4. D2 ~W

Correct answer

A. 3 ~W

Step-by-step solution

=( H ) 60^ = W 3

Practice Magnetic Properties of Matter on Quantrex Academy →

More from Magnetic Properties of Matter

A solenoid has a core made of material with relative permeability 400 . The magnetic field produced in the interior of solenoid is 1.0 T. The magnetic intensity in SI units is 10^5 2026Two identical small bar magnets each of dipole moment 3 5 J/T are placed at a center to center separation of 10 cm, with their axes perpendicular to each other as shown in figure. 2026Given below are two statements: one is labelled as Assertion (A) and the other is labelled as Reason (R). Consider a ferromagnetic material : Assertion (A) : The individual atoms i 2026Given below are two statements : one is labelled as Assertion (A) and the other is labelled as Reason(R). Assertion (A) : Magnetic monopoles do not exist. Reason (R) : Magnetic fie 2025The percentage increase in magnetic field (B) when space within a current carrying solenoid is filled with magnesium (magnetic susceptibility . _ mg =1.2 10⁻⁵ ) is : 2025A solenoid having area A and length ' l ' is filled with a material having relative permeability 2. The magnetic energy stored in the solenoid is : 2025The relationship between the magnetic susceptibility ( ) and the magnetic permeability ( ) is given by : ( ₀ is the permeability of free space and _ r is relative permeability) 2025A bar magnet has total length 2 l=20 units and the field point P is at a distance d =10 units from the centre of the magnet. If the relative uncertainty of length measurement is 1 2025 Full Magnetic Properties of Matter list All JEE Main PYQs