Quantrex AcademyJEE · NEET · NDA PYQs with solutions Open app

NTA Abhyas JEE Main2020PhysicsMagnetic Properties of MatterPractice

A bar magnet of length 10 cm and pole strength 2 A m makes an angle 60 o with a uniform magnetic field of induction 50 T . The couple acting on it is

Options

A5 3 N m
B3 N m
C10 3 N m
D20 3 N m

Correct answer

A. 5 3 N m

Step-by-step solution

C = 2 l m B sin ⁡ θ = 1 0 - 1 × 2 × 5 0 × 3 2 = 5 3 N m

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 2026 Two 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. 2026 Given 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 2026 Given 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 2025 The 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 : 2025 A solenoid having area A and length ' l ' is filled with a material having relative permeability 2. The magnetic energy stored in the solenoid is : 2025 The relationship between the magnetic susceptibility ( ) and the magnetic permeability ( ) is given by : ( ₀ is the permeability of free space and _ r is relative permeability) 2025 A 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 NTA Abhyas JEE Main PYQs