Q: Two like poles of strength \$m_{1}\$ and \$m_{2}\$ are far distance apart. The energy required to bring them \$r_{0}\$ distance apart is

\$V_{1}=\dfrac{\mu _{0}m_{1}}{4\pi \Omega _{0}}\$\$V_{1}=\$magnetic potential\$m_{1}=\$pole strength\$\Omega _{o}\$=distance from \$m_1\$\$Energy=Vm =\dfrac{\mu _{0}m_{1}m_{2}}{4\pi \Omega _{0}}\$

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

Diamagnetic Paramagnetic Ferromagnetic-1 \$\leq\$ \$\chi\$ > 10 \$\leq\$ \$\mu_{r}\$ > 1\$\chi\$ \$=\$ magnetic susceptibility\$\mu_{r}\$ \$=\$ relative permeability.\$\varepsilon\$ < 1 and small.

Q: The relative permeability is represented by\$\mu _{r}\$ and susceptibility is denoted by \$\chi \$ for a magnetic substance then for a paramagnetic substance.

Magnetic susceptibility is a dimensionless proportionality constant that indicates the degree of magnetization of a material in response to an applied magnetic field. \$M=\chi H\$where, \$M\$ is the magnetization of material, \$H\$ is the magnetic field strength.Therefore, \$\chi>0\$Permeability is the measure of the ability of a material to support the formation of a magnetic field within itself. Hence, it is the degree of magnetization that a material obtains in response to an applied magnetic field.\$B=\mu H\$where, \$B\$ is magnetic field, \$H\$ is auxiliary magnetic field.\$\mu>\mu_0\$\$\mu_r=\dfrac{\mu}{\mu_0}>1\$

Question 1

Two like poles of strength $m_{1}$ and $m_{2}$ are far distance apart. The energy required to bring them $r_{0}$ distance apart is

Accepted Answer

$V_{1}=\dfrac{\mu _{0}m_{1}}{4\pi \Omega _{0}}$$V_{1}=$magnetic potential$m_{1}=$pole strength$\Omega _{o}$=distance from $m_1$$Energy=Vm =\dfrac{\mu _{0}m_{1}m_{2}}{4\pi \Omega _{0}}$

Question 2

Assertion (A): A magnet remains stable, If it aligns itself with the fieldReason (R): The P.E. of a bar magnet is minimum, if it is parallel to magnetic field.

Accepted Answer

The magnet remains stable,if it align itself with the field as  its potential will be minimum in that position.$\mu=-\vec{M}.\vec{B}$=$-MB\cos \Theta $The potential energy will be minimum if  $\Theta =0$i.e. $-MB$$\therefore  $ If it is parallel to magnet field

Question 3

In case of a bar magnet, lines of magnetic induction

Accepted Answer

Magnetic lines of force in a bar magnet are continuous forming closed loops as shown in the figure.Outside the magnet, the lines run from north pole to south pole whereas oppositely inside.

Question 4

Out of dia, para and ferromagnetism, the universal property of all substances is

Accepted Answer

Diamagnetic materials create an induced magnetic field in a direction opposite to an externally applied magnetic field, and are repelled by the applied magnetic field. In contrast, the opposite behavior is exhibited by paramagnetic materials. Ferromagnetic substances  having a high susceptibility to magnetization.

Question 5

Assertion (A) : To protect any instrument from external magnetic field, it is put inside an iron boxReason (R) : Iron is a ferromagnetic substance

Accepted Answer

To protect any instrument from external magnetic field it is put inside an iron box as iron is a ferromagnetic substance it will not get magnetize by the magnetic field due which there will not be any effect of magnetic field on the instrument.

Question 6

A compass needle, which shows the direction at the earth's magnetic pole is

Accepted Answer

For a compass to show the direction of magnetic pole moment , they must be placed at ether of the $2$ geographic poles . It is because the direction of magnetic moment is from south to north pole. The compass therefore will be vertical at both the poles.

Question 7

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

Accepted Answer

Diamagnetic Paramagnetic Ferromagnetic-1 $\leq$ $\chi$ < 0 0 < $\chi$ < $\varepsilon$ $\chi$ >> 10 $\leq$ $\mu_{r}$ < 1 1 < $\mu_{r}$ < 1+ $\varepsilon$ $\mu_{r}$ >> 1$\chi$ $=$ magnetic susceptibility$\mu_{r}$ $=$ relative permeability.$\varepsilon$ < 1 and small.

Question 8

The relative permeability is represented by$\mu _{r}$ and susceptibility is denoted by $\chi $ for a magnetic substance then for a paramagnetic substance.

Accepted Answer

Magnetic susceptibility is a dimensionless proportionality constant that indicates the degree of magnetization of a material in response to an applied magnetic field. $M=\chi H$where, $M$ is the magnetization of material, $H$ is the magnetic field strength.Therefore, $\chi>0$Permeability is the measure of the ability of a material to support the formation of a magnetic field within itself. Hence, it is the degree of magnetization that a material obtains in response to an applied magnetic field.$B=\mu H$where, $B$ is magnetic field, $H$ is auxiliary magnetic field.$\mu>\mu_0$$\mu_r=\dfrac{\mu}{\mu_0}>1$

Question 9

Ferromagnetic ore properties are due to

Accepted Answer

Partially filled inner sub-shells,due to the magnetic moment of unpaired electrons in partially filled inner sub-shells which got align in a particular direction in the presence of external magnetic field.

Question 10

Permanent magnets are made from

Accepted Answer

Ferromagnetic substance, Because they get magnetize in external magnetic field and don't lose their magnetic property.

Magnetism And Matter

Physics
4440 Views

Two like poles of strength $m_{1}$ and $m_{2}$ are far distance apart. The energy required to bring them $r_{0}$ distance apart is

Assertion (A): A magnet remains stable, If it aligns itself with the field
Reason (R): The P.E. of a bar magnet is minimum, if it is parallel to magnetic field.

In case of a bar magnet, lines of magnetic induction

Out of dia, para and ferromagnetism, the universal property of all substances is

Assertion (A) : To protect any instrument from external magnetic field, it is put inside an iron box
Reason (R) : Iron is a ferromagnetic substance

A compass needle, which shows the direction at the earth's magnetic pole is

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

The relative permeability is represented by $μ_{r}$ and susceptibility is denoted by $χ$ for a magnetic substance then for a paramagnetic substance.

Ferromagnetic ore properties are due to

Permanent magnets are made from

Magnetism And Matter

Physics 4440 Views

Two like poles of strength m1​ and m2​ are far distance apart. The energy required to bring them r0​ distance apart is

Assertion (A): A magnet remains stable, If it aligns itself with the fieldReason (R): The P.E. of a bar magnet is minimum, if it is parallel to magnetic field.

In case of a bar magnet, lines of magnetic induction

Out of dia, para and ferromagnetism, the universal property of all substances is

Assertion (A) : To protect any instrument from external magnetic field, it is put inside an iron box Reason (R) : Iron is a ferromagnetic substance

A compass needle, which shows the direction at the earth's magnetic pole is

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

The relative permeability is represented byμr​ and susceptibility is denoted by χ for a magnetic substance then for a paramagnetic substance.

Ferromagnetic ore properties are due to

Permanent magnets are made from

Physics
4440 Views

Two like poles of strength $m_{1}$ and $m_{2}$ are far distance apart. The energy required to bring them $r_{0}$ distance apart is

Assertion (A): A magnet remains stable, If it aligns itself with the field
Reason (R): The P.E. of a bar magnet is minimum, if it is parallel to magnetic field.

Assertion (A) : To protect any instrument from external magnetic field, it is put inside an iron box
Reason (R) : Iron is a ferromagnetic substance

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

The relative permeability is represented by $μ_{r}$ and susceptibility is denoted by $χ$ for a magnetic substance then for a paramagnetic substance.