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JEE Main 20199 JanuaryMorning Shift
Exam
JEE Main
Year
2019
Date
9 January
Shift
Morning Shift
Subject
Physics
Chapter
Magnetic Properties of Matter

JEE Main 2019 · 9 January · Morning Shift · Physics · Magnetic Properties of Matter

A bar magnet is demagnetized by inserting it inside a solenoid of...

A bar magnet is demagnetized by inserting it inside a solenoid of length 0.2m,1000.2m, 100 turns, and carrying a current of 5.2A.5.2A . The coercivity of the bar magnet is:

Options

  1. A285A/m285A / m
  2. B2600A/m2600A / m
  3. C520A/m520A / m
  4. D1200A/m1200A / m

Correct answer

B. 2600A/m2600A / m

Step-by-step solution

Coercivity =nI=1000.2×5.2A/m= nI = \dfrac{100}{0.2} \times 5.2A / m

=2600A/m= 2600A / m
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