Quantrex Quantrex AcademyJEE · NEET · NDA PYQs with solutions Open app
Manipal MET2014PhysicsMagnetic Properties of Matter

- The coereivity of a small bar magnet is 4 10^3 ~A / m . It is inserted inside a solenoid of 500 turns and length 1 m to demagnetise it. The amount of current to be passed through the solenoid will be

Options

  1. A2.5 A
  2. B5 A
  3. C8 A
  4. D10 A

Correct answer

C. 8 A

Step-by-step solution

H=n i i= H n = 4 10^3 500 =8 ~A

Practice Magnetic Properties of Matter on Quantrex Academy →

More from Magnetic Properties of Matter

On both sides of a magnetic needle, two short magnets A and B are placed on the same horizontal line which is perpendicular to the magnetic meridian. The south poles of A and B are 2026The material selected for making a permanent magnet should have: 2026A bar magnet of length 12 cm is placed such that its north pole points towards the geographic north. Two neutral points which are separated by 16 cm are obtained on the equatorial 2026Paramagnetic substances 2026If a paramagnetic bar is brought near a bar magnet, then it is 2026Pick out the WRONG statements about magnetic substances. ( = magnetic susceptibility) ( _r = relative permeability). I. Substances with -1 II. Substances with 1 are paramagnetic. I 2026The periodic time of a magnet in vibration magnetometer is T₀ . If a magnet is replaced by another magnet whose moment of inertia is three times and magnetic moment is one-third of 2026The frequency of oscillation of a small magnet in a magnetic field of induction 'B' is ' n '. If the frequency of oscillations of the same magnet in a field of induction 'X' falls 2026 Full Magnetic Properties of Matter list All Manipal MET PYQs