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

Relative permittivity and permeability of a material are $\varepsilon _{r}$ and $\mu _{r}$ respectively. The values of these quantities allowed for a diamagnetic material are

  1. $\varepsilon _{r}=0.5,\mu _{r}=1.5$

  2. $\varepsilon _{r}=1.5,\mu _{r}=0.5$

  3. $\varepsilon _{r}=0.5,\mu _{r}=0.5$

  4. $\varepsilon _{r}=1.5,\mu _{r}=1.5$
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

For diamagnetic material
$0\leq \mu _{r}< 1$
And for any material, $ \varepsilon _{r}> 1$

So, option B.

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

Magnetism is a property present in ___________.

  1. Only a few materials

  2. Only ferromagnetic material

  3. Only paramagnetic material

  4. All materials
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Magnetization is present in all materials. It is a class of physical phenomenon that is mediated by Magnetic fields.

The magnetic state of different materials depends on temperature and other variables such as pressure and applied magnetic field.

 

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

Relative permittivity and permeability of a material are $\epsilon _{\mathrm{r}}$ and $\mu _{\mathrm{r}}$, respectively. Which of the following values of these quantifies are allowed for a diamagnetic material? 

  1. $\epsilon _{\mathrm{r}}=0.5,\ \mu _{\mathrm{r}}=0.5$

  2. $\epsilon _{\mathrm{r}}=1.5,\ \mu _{\mathrm{r}}=1.5$

  3. $\epsilon _{\mathrm{r}}=0.5,\ \mu _{\mathrm{r}}=1.5$

  4. $\epsilon _{\mathrm{r}}=1.5,\ \mu _{\mathrm{r}}=0.5$
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

For a diamagnetic material, $\mu _r$ and $\epsilon _r$ should have following bounds $0<\mu _r <1$ and for any material $\epsilon _r >1$

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

Needles $N _{1}, N _{2}$ and $N _{3}$ are made of a ferromagnetic, a paramagnetic and a diamagnetic substance respectively. A magnet when brought close to them will 

  1. attract all three of them.

  2. attract $\mathrm{N} _{1}$ and $\mathrm{N} _{2}$ strongly but repel $\mathrm{N} _{3}$.&nbsp;

  3. attract $\mathrm{N} _{1}$ strongly, $\mathrm{N} _{2}$ weakly and repel $\mathrm{N} _{3}$ weakly.

  4. attract $\mathrm{N} _{1}$ strongly, but repel $\mathrm{N} _{2}$ and $\mathrm{N} _{3}$ weakly.
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Ferromagnetic substances are strongly attracted by a magnet while, paramagnetic and diamaganetic substances are weakly attracted and repelled respectively.

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

Curie temperature is the temperature above which 

  1. a ferromagnetic material becomes paramagnetic

  2. a paramagnetic material becomes diamagnetic

  3. a ferromagnetic material becomes diamagnetic

  4. a paramagnetic material becomes ferromagnetic.
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

The Curie temperature is the temperature above which ferromagnetic materials lose their permanent magnetic field, the magnetism completely disappears. Above Curie temperature, the material behaves para-magnetically.

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

A ferromagnetic material is placed in an external magnetic field. The magnetic domains 

  1. Increase in size

  2. Decrease in size

  3. May increase or decrease is size

  4. Have no relation with the field
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

When a ferromagnetic material is placed in an external magnetic field, the magnetic domains that are aligned with the field grow in size at the expense of those that are not, leading to magnetization.

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

The magnetic susceptibility is negative for

  1. Paramagnetic materials only

  2. Diamagnetic material only

  3. Ferromagnetic materials only

  4. paramagnetic and ferromagnetic materials
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Magnetic susceptibility is defined as the ratio of magnetization to the magnetic field intensity. For diamagnetic materials, the induced magnetization is in the opposite direction to the applied field, resulting in negative susceptibility.

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

The relative permeability of silicon is $0.99837$ and that of palladium is $1.00692$, choose the correct option from the following :

  1. silicon is paramagnetic and palladium is ferromagnetic

  2. silicon is ferromagnetic and palladium is paramagnetic

  3. silicon is diamagnetic and palladium is paramagnetic

  4. Both are paramagnetic
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Diamagnetic           Paramagnetic             Ferromagnetic
-1 $\leq$ $\chi$ < 0                  0 < $\chi$ < $\varepsilon$                  $\chi$ >> 1
0 $\leq$ $\mu _{r}$ < 1                1 < $\mu _{r}$ < 1+ $\varepsilon$               $\mu _{r}$ >> 1
$\chi$ $=$ magnetic susceptibility
$\mu _{r}$ $=$ relative permeability.
$\varepsilon$ < 1 and small.