Verified Solution • 2025–26 Session moderate

QJEEM19Ph4fbc: JEE Main 2019 Physics - Class 12 JEEM19Ph4fbc Solution: A bar magnet is demagnetized by inserting it inside a solenoid…

A bar magnet is demagnetized by inserting it inside a solenoid of length 0.2 m, 100 turns, and carrying a current of 5.2 A. The corecivity of the bar magnet is :

Multiple Choice Options

  • A 285 A/m
  • B 2600 A/m
  • C 520 A/m
  • D 1200 A/m

Step-by-Step Verified Solution

Coercivity, H = Bμ0

Inside solenoid the magnetic field,

B = μ0ni

∴   H = μ0niμ0

= ni

= Nℓ×i

= 1000.2×5.2

= 2600 A/m

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