Tag: magnetism and matter

Quizzes (4) Questions (67)

Questions Related to magnetism and matter

Multiple choice physics magnetism and matter magnetic materials behaviour of substances in magnetic field classification of magnetic materials

The magnetic materials having negative magnetic susceptibility are

  1. non-magnetic

  2. para magnetic

  3. dia magnetic

  4. ferro magnetic
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Magnetic susceptibility is a dimensionless proportionality constant that indicates the degree of magnetisation of a material in response to an applied magnetic field.

Substances such as copper, iron have negative susceptibility as these substances are diamagnetic substances.
Substances with negative susceptibility signifies that they are repelled by magnets.

Multiple choice physics magnetism and matter magnetic materials behaviour of substances in magnetic field classification of magnetic materials

Which of the following group is diamagnetic?

  1. Copper, hydrogen, silver

  2. Copper, hydrogen, argon

  3. Hydrogen, oxygen, argon

  4. Copper, silver, oxygen
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Diamagnetic substances are those which are freebly repelled by the magnetic field.
$\therefore$ Copper, Hydrogen, Silver are diamagnetic as their atoms have net magnetic dipole moment zero.

Multiple choice physics magnetism and matter magnetic materials behaviour of substances in magnetic field classification of magnetic materials

The inherent property of all materials is

  1. Diamagnetism

  2. Paramagnetism

  3. Ferromagnetism

  4. Both a and b
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Diamagnetism (where orbital motion of electrons creates tiny atomic current loops, which produce magnetic fields) is a property of all materials and opposes applied magnetic fields, but is very weak.

Multiple choice physics magnetism and matter magnetic materials behaviour of substances in magnetic field classification of magnetic materials

A thin diamagnetic rod is placed vertically between the poles of an electromagnet. When the current in the electromagnet is switched on, then the diamagnetic rod is pushed up, out of the horizontal magnetic field. Hence the rod gains gravitational potential energy. The work required to do this comes from.

  1. The lattice structure of the material of the rod

  2. The current source

  3. The induced electric field due to the changing magnetic field

  4. The magnetic field
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Here when electromagnet is connected to battery, emf source the magnetic field is produced which pushes rod upwards and so gravitational potential energy is stored.

This stored energy will require work which will come from current source or battery which is connected to electromagnet.
So option 2 is correct answer

Multiple choice physics magnetism and matter magnetic materials behaviour of substances in magnetic field classification of magnetic materials

A paramagnet magnet behaves like a solenoid because both contain currents in the form of

  1. Circles

  2. Parabola

  3. Straight line

  4. Ellipse
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

A paramagnet magnet behaves like a solenoid because both contain currents in the form of circle. The magnetic field is generated by the circular motion of the electron inside the atom.

Multiple choice physics magnetism and matter magnetic materials behaviour of substances in magnetic field classification of magnetic materials

Domain formation is the necessary features of

  1. Diamagnetism

  2. Paramagnetism

  3. Ferromagnetism

  4. All of these
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Ferromagnetism materials exhibit a long range ordering phenomenon at the atomic level which causes the unpaired electron spins to line up parallel with each other in a region called domain. Within the domain, the magnetic field is intense, but in a bulk sample the material will usually be unmagnetised because the many domains will themselves be randomly oriented with respect to one another. Hence, domain formation is the necessary feature of ferromagnetic substance.

Multiple choice physics magnetism and matter magnetic materials behaviour of substances in magnetic field classification of magnetic materials

If a solution of ferromagnetic material is poured into a U-tube and one arm of this is placed between the poles of a strong magnet with the meniscus in line with the field, then the level of the solution will:

  1. Rise

  2. Fall

  3. Rise till the liquid comes out

  4. Remain unchanged
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Ferromagnetic materials are strongly attracted to magnetic fields. When placed in a non-uniform magnetic field (like between the poles of a magnet), the liquid will be pulled toward the region of higher field strength, causing the level in that arm to rise.

Multiple choice physics magnetism and matter magnetic materials behaviour of substances in magnetic field classification of magnetic materials

The value of magnetic susceptibility for para-magnetic substance is  

  1. infinity

  2. low positive

  3. low negative

  4. zero
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Paramagnetic substance gets feebly magnetised in the direction of field and therefore, $I$ is very small and positive for paramagntic substances.
We know $X _m=I/H$
Therefore,$X _m$ is also very small and positive.