Quantrex Quantrex AcademyJEE · NEET · NDA PYQs with solutions Open app
NEETPhysicsMagnetic Properties of Matter

Given below are two statements: one is labelled as Assertion A and the other is labelled as Reason R Assertion A : A bar magnet dropped through a metallic cylindrical pipe takes more time to come down compared to a non-magnetic bar with same geometry and mass. Reason R : For the magnetic bar, Eddy currents are produced in the metallic pipe which oppose the motion of the magnetic bar. In the light of the above stateme

Options

  1. AA is false but R is true
  2. BBoth A and R are true and R is the correct explanation of A
  3. CA is true but R is false
  4. DBoth A and R are true and R is NOT the correct explanation of A

Correct answer

B. Both A and R are true and R is the correct explanation of A

Step-by-step solution

Due to change in flux, eddy current is produced which opposes the motion in the metallic pipe for the bar magnet. Eddy currents are loops of electrical current induced within conductors by a changing magnetic field in the conductor according to Faraday's law of induction. Eddy currents flow in closed loops within conductors, in planes perpendicular to the magnetic field. Hence, R is the correct explanation and both statements are true.

Practice Magnetic Properties of Matter on Quantrex Academy →

More from Magnetic Properties of Matter

A magnetizing field of 360 A/m produces a magnetic flux density B = 0.6 T in a ferromagnetic material. The permeability of the material in T-m/A is 2026There are four lightweight rod samples P, Q, R and S separately suspended by thread. A bar magnet is slowly brought near to each sample and the following observations are noted (a) 2026A paramagnetic sample shows a net magnetization of 8 A/m when placed in an external magnetic field of 0.6 T at a temperature of 4 K. When the same sample is placed in an external m 2026A magnetizing field of 10^3 A/m produces a magnetic flux density 4 T in an iron rod. The relative permeability of the rod will be (permeability of free space ₀ = 4 10⁻⁷ SI units) 2026In an experiment, the interior of a first current-carrying toroid with 1000 turns per unit length is filled with aluminum (susceptibility 2.4 10⁻⁵ ). A second, identical toroid wit 2026Magnetic susceptibility ( ) is related to magnetic relative permeability ( _r ) by the relation 2026A magnetic material has a relative permeability ( _r) of 6001 . If it is placed in a magnetizing field (magnetic intensity) of H = 2000 A/m , The total magnetic induction (B) insid 2026Which of the following statements is INCORRECT for diamagnetic materials? a. Relative permeability is less than one. b. Magnetic susceptibility is negative and low. c. Magnetic sus 2026 Full Magnetic Properties of Matter list All NEET PYQs