03. Magnetism, Magnetic Properties and Magnetisation
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Magnetism and Matter

154346 A thin magnetic needle vibrates in the horizontal plane with a period of $4 \mathrm{~s}$. The needle is cut into two halves by a plane normal to the magnetic axis of the needle. Then, the period of vibration of each half needle is approximately.

1 $4 \mathrm{~s}$
2 $2 \mathrm{~s}$
3 $8 \mathrm{~s}$
4 $1 \mathrm{~s}$
BCECE-2017
Magnetism and Matter

154350 The relative permeability is represented by $\mu_{\mathrm{r}}$ and the susceptibility by $\chi$ for a magnetic substance. Then for a paramagnetic substance

1 $\mu_{\mathrm{r}}>1, \chi \lt 0$
2 $\mu_{\mathrm{r}}>1, \chi>0$
3 $\mu_{\mathrm{r}} \lt 1, \chi \lt 0$
4 $\mu_{\mathrm{r}} \lt 1, \chi>0$
JCECE-2017
Magnetism and Matter

154352 A bar magnet of length $3 \mathrm{~cm}$ has point $A$ and $B$ along its axis at distances of $24 \mathrm{~cm}$ and $48 \mathrm{~cm}$ on the opposite sides. Ratio of magnetic fields at these points will be

1 8
2 $\frac{1}{2 \sqrt{2}}$
3 3
4 4
Magnetism and Matter

154355 Two bar magnets having same geometry with magnetic moments $M$ and $2 M$, are firstly placed in such a way that their similar poles are on same side. Then, its time period of oscillation is $T_{1}$. Now, the polarity of the one of the magnet is reversed. Then, time period of oscillation is $T_{2}$, then

1 $\mathrm{T}_{1} \lt \mathrm{T}_{2}$
2 $\mathrm{T}_{1}=\mathrm{T}_{2}$
3 $\mathrm{T}_{1}>\mathrm{T}_{2}$
4 $\mathrm{T}_{2}=\infty$
Manipal UGET-2016
Magnetism and Matter

154357 If dielectric constant of water is 81 , then its permittivity is

1 $7.2 \times 10^{-10} \frac{\mathrm{C}^{2}}{\mathrm{~N}-\mathrm{m}^{2}}$
2 $8.86 \times 10^{-9} \frac{\mathrm{C}^{2}}{\mathrm{~N}-\mathrm{m}^{2}}$
3 $1.02 \times 10^{-12} \frac{\mathrm{C}^{2}}{\mathrm{~N}-\mathrm{m}^{2}}$
4 None of the above
CG PET- 2007
NEET DIGITAL LIBRARY
Magnetism and Matter

154346 A thin magnetic needle vibrates in the horizontal plane with a period of $4 \mathrm{~s}$. The needle is cut into two halves by a plane normal to the magnetic axis of the needle. Then, the period of vibration of each half needle is approximately.

1 $4 \mathrm{~s}$
2 $2 \mathrm{~s}$
3 $8 \mathrm{~s}$
4 $1 \mathrm{~s}$
BCECE-2017
Magnetism and Matter

154350 The relative permeability is represented by $\mu_{\mathrm{r}}$ and the susceptibility by $\chi$ for a magnetic substance. Then for a paramagnetic substance

1 $\mu_{\mathrm{r}}>1, \chi \lt 0$
2 $\mu_{\mathrm{r}}>1, \chi>0$
3 $\mu_{\mathrm{r}} \lt 1, \chi \lt 0$
4 $\mu_{\mathrm{r}} \lt 1, \chi>0$
JCECE-2017
Magnetism and Matter

154352 A bar magnet of length $3 \mathrm{~cm}$ has point $A$ and $B$ along its axis at distances of $24 \mathrm{~cm}$ and $48 \mathrm{~cm}$ on the opposite sides. Ratio of magnetic fields at these points will be

1 8
2 $\frac{1}{2 \sqrt{2}}$
3 3
4 4
Magnetism and Matter

154355 Two bar magnets having same geometry with magnetic moments $M$ and $2 M$, are firstly placed in such a way that their similar poles are on same side. Then, its time period of oscillation is $T_{1}$. Now, the polarity of the one of the magnet is reversed. Then, time period of oscillation is $T_{2}$, then

1 $\mathrm{T}_{1} \lt \mathrm{T}_{2}$
2 $\mathrm{T}_{1}=\mathrm{T}_{2}$
3 $\mathrm{T}_{1}>\mathrm{T}_{2}$
4 $\mathrm{T}_{2}=\infty$
Manipal UGET-2016
Magnetism and Matter

154357 If dielectric constant of water is 81 , then its permittivity is

1 $7.2 \times 10^{-10} \frac{\mathrm{C}^{2}}{\mathrm{~N}-\mathrm{m}^{2}}$
2 $8.86 \times 10^{-9} \frac{\mathrm{C}^{2}}{\mathrm{~N}-\mathrm{m}^{2}}$
3 $1.02 \times 10^{-12} \frac{\mathrm{C}^{2}}{\mathrm{~N}-\mathrm{m}^{2}}$
4 None of the above
CG PET- 2007
Join With Us for More Updates
Magnetism and Matter

154346 A thin magnetic needle vibrates in the horizontal plane with a period of $4 \mathrm{~s}$. The needle is cut into two halves by a plane normal to the magnetic axis of the needle. Then, the period of vibration of each half needle is approximately.

1 $4 \mathrm{~s}$
2 $2 \mathrm{~s}$
3 $8 \mathrm{~s}$
4 $1 \mathrm{~s}$
BCECE-2017
Magnetism and Matter

154350 The relative permeability is represented by $\mu_{\mathrm{r}}$ and the susceptibility by $\chi$ for a magnetic substance. Then for a paramagnetic substance

1 $\mu_{\mathrm{r}}>1, \chi \lt 0$
2 $\mu_{\mathrm{r}}>1, \chi>0$
3 $\mu_{\mathrm{r}} \lt 1, \chi \lt 0$
4 $\mu_{\mathrm{r}} \lt 1, \chi>0$
JCECE-2017
Magnetism and Matter

154352 A bar magnet of length $3 \mathrm{~cm}$ has point $A$ and $B$ along its axis at distances of $24 \mathrm{~cm}$ and $48 \mathrm{~cm}$ on the opposite sides. Ratio of magnetic fields at these points will be

1 8
2 $\frac{1}{2 \sqrt{2}}$
3 3
4 4
Magnetism and Matter

154355 Two bar magnets having same geometry with magnetic moments $M$ and $2 M$, are firstly placed in such a way that their similar poles are on same side. Then, its time period of oscillation is $T_{1}$. Now, the polarity of the one of the magnet is reversed. Then, time period of oscillation is $T_{2}$, then

1 $\mathrm{T}_{1} \lt \mathrm{T}_{2}$
2 $\mathrm{T}_{1}=\mathrm{T}_{2}$
3 $\mathrm{T}_{1}>\mathrm{T}_{2}$
4 $\mathrm{T}_{2}=\infty$
Manipal UGET-2016
Magnetism and Matter

154357 If dielectric constant of water is 81 , then its permittivity is

1 $7.2 \times 10^{-10} \frac{\mathrm{C}^{2}}{\mathrm{~N}-\mathrm{m}^{2}}$
2 $8.86 \times 10^{-9} \frac{\mathrm{C}^{2}}{\mathrm{~N}-\mathrm{m}^{2}}$
3 $1.02 \times 10^{-12} \frac{\mathrm{C}^{2}}{\mathrm{~N}-\mathrm{m}^{2}}$
4 None of the above
CG PET- 2007
For More Updates join with Us
Magnetism and Matter

154346 A thin magnetic needle vibrates in the horizontal plane with a period of $4 \mathrm{~s}$. The needle is cut into two halves by a plane normal to the magnetic axis of the needle. Then, the period of vibration of each half needle is approximately.

1 $4 \mathrm{~s}$
2 $2 \mathrm{~s}$
3 $8 \mathrm{~s}$
4 $1 \mathrm{~s}$
BCECE-2017
Magnetism and Matter

154350 The relative permeability is represented by $\mu_{\mathrm{r}}$ and the susceptibility by $\chi$ for a magnetic substance. Then for a paramagnetic substance

1 $\mu_{\mathrm{r}}>1, \chi \lt 0$
2 $\mu_{\mathrm{r}}>1, \chi>0$
3 $\mu_{\mathrm{r}} \lt 1, \chi \lt 0$
4 $\mu_{\mathrm{r}} \lt 1, \chi>0$
JCECE-2017
Magnetism and Matter

154352 A bar magnet of length $3 \mathrm{~cm}$ has point $A$ and $B$ along its axis at distances of $24 \mathrm{~cm}$ and $48 \mathrm{~cm}$ on the opposite sides. Ratio of magnetic fields at these points will be

1 8
2 $\frac{1}{2 \sqrt{2}}$
3 3
4 4
Magnetism and Matter

154355 Two bar magnets having same geometry with magnetic moments $M$ and $2 M$, are firstly placed in such a way that their similar poles are on same side. Then, its time period of oscillation is $T_{1}$. Now, the polarity of the one of the magnet is reversed. Then, time period of oscillation is $T_{2}$, then

1 $\mathrm{T}_{1} \lt \mathrm{T}_{2}$
2 $\mathrm{T}_{1}=\mathrm{T}_{2}$
3 $\mathrm{T}_{1}>\mathrm{T}_{2}$
4 $\mathrm{T}_{2}=\infty$
Manipal UGET-2016
Magnetism and Matter

154357 If dielectric constant of water is 81 , then its permittivity is

1 $7.2 \times 10^{-10} \frac{\mathrm{C}^{2}}{\mathrm{~N}-\mathrm{m}^{2}}$
2 $8.86 \times 10^{-9} \frac{\mathrm{C}^{2}}{\mathrm{~N}-\mathrm{m}^{2}}$
3 $1.02 \times 10^{-12} \frac{\mathrm{C}^{2}}{\mathrm{~N}-\mathrm{m}^{2}}$
4 None of the above
CG PET- 2007
NEET DIGITAL LIBRARY
Magnetism and Matter

154346 A thin magnetic needle vibrates in the horizontal plane with a period of $4 \mathrm{~s}$. The needle is cut into two halves by a plane normal to the magnetic axis of the needle. Then, the period of vibration of each half needle is approximately.

1 $4 \mathrm{~s}$
2 $2 \mathrm{~s}$
3 $8 \mathrm{~s}$
4 $1 \mathrm{~s}$
BCECE-2017
Magnetism and Matter

154350 The relative permeability is represented by $\mu_{\mathrm{r}}$ and the susceptibility by $\chi$ for a magnetic substance. Then for a paramagnetic substance

1 $\mu_{\mathrm{r}}>1, \chi \lt 0$
2 $\mu_{\mathrm{r}}>1, \chi>0$
3 $\mu_{\mathrm{r}} \lt 1, \chi \lt 0$
4 $\mu_{\mathrm{r}} \lt 1, \chi>0$
JCECE-2017
Magnetism and Matter

154352 A bar magnet of length $3 \mathrm{~cm}$ has point $A$ and $B$ along its axis at distances of $24 \mathrm{~cm}$ and $48 \mathrm{~cm}$ on the opposite sides. Ratio of magnetic fields at these points will be

1 8
2 $\frac{1}{2 \sqrt{2}}$
3 3
4 4
Magnetism and Matter

154355 Two bar magnets having same geometry with magnetic moments $M$ and $2 M$, are firstly placed in such a way that their similar poles are on same side. Then, its time period of oscillation is $T_{1}$. Now, the polarity of the one of the magnet is reversed. Then, time period of oscillation is $T_{2}$, then

1 $\mathrm{T}_{1} \lt \mathrm{T}_{2}$
2 $\mathrm{T}_{1}=\mathrm{T}_{2}$
3 $\mathrm{T}_{1}>\mathrm{T}_{2}$
4 $\mathrm{T}_{2}=\infty$
Manipal UGET-2016
Magnetism and Matter

154357 If dielectric constant of water is 81 , then its permittivity is

1 $7.2 \times 10^{-10} \frac{\mathrm{C}^{2}}{\mathrm{~N}-\mathrm{m}^{2}}$
2 $8.86 \times 10^{-9} \frac{\mathrm{C}^{2}}{\mathrm{~N}-\mathrm{m}^{2}}$
3 $1.02 \times 10^{-12} \frac{\mathrm{C}^{2}}{\mathrm{~N}-\mathrm{m}^{2}}$
4 None of the above
CG PET- 2007