Sign in
12thPass logo
New chatPYQ LibraryDoubtsRank report
Sign in to see Recents

Your guest activity stays on this device

Sign in to save progress →
Sign in

Magnetic Properties of Matter question

2023 · 10 Apr · Shift 1 · Q73
Guest · filters and generic practice availableBrowsing as a guest · PYQ filters and generic practice are available. Sign in only for personalised features and saved progress.
  1. PYQ Library
  2. /JEE Main
  3. /Physics
  4. /Magnetic Properties of Matter
  5. /2023 · 10 Apr · Shift 1 · Q73

Magnetic Properties of Matter question

2023 · 10 Apr · Shift 1 · Q73

JEE MainPhysicsMagnetic Properties of MatterNumerical+4 / −1
The current required to be passed through a solenoid of 15 cm length and 60 turns in order of demagnetise a bar magnet of magnetic intensity 2.4×103 Am−12.4\times10^3~Am^{-1}2.4×103 Am−1 is ‾\underline{\hspace{2cm}}​ A.
Numerical answer
View written solutionFree

Correct answer: 6

  1. Use the relation between magnetic field strength and solenoid current

For a solenoid, the magnetic field strength (magnetising field) is

H=nI=NLIH = nI = \frac{N}{L}IH=nI=LN​I

where:

  • HHH = magnetic field intensity in A m−1A\,m^{-1}Am−1
  • NNN = number of turns
  • LLL = length of solenoid
  • III = current

To demagnetise the bar magnet, the solenoid must produce a magnetising field equal in magnitude to the magnetic intensity of the magnet.

So,

H=2.4×103 A m−1H = 2.4 \times 10^3\ A\,m^{-1}H=2.4×103 Am−1

  1. Substitute the given values

Given:

  • N=60N = 60N=60
  • L=15 cm=0.15 mL = 15\text{ cm} = 0.15\text{ m}L=15 cm=0.15 m
  • H=2.4×103 A m−1H = 2.4 \times 10^3\ A\,m^{-1}H=2.4×103 Am−1

Using

H=NLIH = \frac{N}{L}IH=LN​I

we get

2.4×103=600.15I2.4 \times 10^3 = \frac{60}{0.15}I2.4×103=0.1560​I

  1. Simplify

600.15=400\frac{60}{0.15} = 4000.1560​=400

So,

2400=400I2400 = 400I2400=400I

I=2400400=6I = \frac{2400}{400} = 6I=4002400​=6

  1. Final answer

6 A\boxed{6\text{ A}}6 A​

  1. Comparison with stored answer

Stored correct answer = 666

Our derived answer also is 666, so they agree.

PreviousNext

More from Magnetic Properties of Matter

  • A bar magnet is released from rest along the axis of a very long vertical copper tube. After some time the magnet will2023 · MCQ
  • Given below are two statements: Statement I : For diamagnetic substance, $$-1 \leq \chi Statement II : Diamagnetic substances when placed in an external magnetic field, tend to move from stronger to weaker part of the field. In the light…2023 · MCQ
  • The free space inside a current carrying toroid is filled with a material of susceptibility 2×10−2. The percentage increase in the value of magnetic field inside the toroid will be2023 · MCQ
  • Given below are two statements: Statement I : The diamagnetic property depends on temperature. Statement II : The induced magnetic dipole moment in a diamagnetic sample is always opposite to the magnetizing field. In the light of given…2023 · MCQ
  • A solenoid of 1200 turns is wound uniformly in a single layer on a glass tube 2 m long and 0.2 m in diameter. The magnetic intensity at the center of the solenoid when a current of 2 A flows through it is :2023 · MCQ
  • A bar magnet with a magnetic moment 5.0Am2 is placed in parallel position relative to a magnetic field of 0.4 T. The amount of required work done in turning the magnet from parallel to antiparallel position…2023 · MCQ
  • The soft-iron is a suitable material for making an electromagnet. This is because soft-iron has2022 · MCQ
  • Given below are two statements : Statement I : Susceptibilities of paramagnetic and ferromagnetic substances increase with decrease in temperature. Statement II : Diamagnetism is a result of orbital motions of electrons developing magnetic…2022 · MCQ