Quantrex Quantrex AcademyJEE · NEET · NDA PYQs with solutions Open app
JEE Main202310 Apr 2023Evening ShiftPhysicsMagnetic Properties of MatterActual

A bar magnet is released from rest along the axis of a very long vertical copper tube. After some time the magnet will

Options

  1. AMove down with an acceleration equal to g
  2. BOscillate inside the tube
  3. CMove down with almost constant speed
  4. DMove down with an acceleration greater than g

Correct answer

C. Move down with almost constant speed

Step-by-step solution

The flux connected to the copper tube will fluctuate when the magnet moves under the influence of gravity. Eddy currents will be created in the copper tube's body as a result, these induced currents oppose the collapse of the magnet, in accordance with Lenz's law. A retarding force will consequently act on the magnet. This force will keep rising with the magnet's rising velocity until it equals the force of gravity. The net force acting on the magnet will then vanish. The magnet will therefore reach a s

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