01. Earth Magnetism
Magnetism and Matter

154094 A vibration magnetometer is used at two different places $A$ and $B$ on the earth. The time period of a magnet suspended freely in the magnetometer at $A$ is twice that at $B$. If the horizontal component of the earth's magnetic field at $B$ is $32 \times 10^{-6} \mathrm{~T}$, then its value at $A$ is

1 $\mathrm{H}_{\mathrm{A}}=8 \times 10^{-6} \mathrm{~T}$
2 $\mathrm{H}_{\mathrm{A}}=32 \times 10^{-6} \mathrm{~T}$
3 $\mathrm{H}_{\mathrm{A}}=4 \times 10^{-6} \mathrm{~T}$
4 $\mathrm{H}_{\mathrm{A}}=16 \times 10^{-6} \mathrm{~T}$
Magnetism and Matter

154095 If a bar magnet is cut along the dotted line as shown in the figure and the two pieces are held separated by a small distance as they are, then

1 They repel each other.
2 They attract each other.
3 They do not experience any force on each other.
4 Will repel or attract depending on the location of cut.
Magnetism and Matter

154096 On the magnetic meridian at some place of the Earth's surface the vertical component of the earth's magnetic field is $0.433 \mathrm{G}$ and the dip angle is $60^{\circ}$. Then the magnetic field of the earth at this place is

1 $0.5 \mathrm{G}$
2 $1.4 \mathrm{G}$
3 $1.7 \mathrm{G}$
4 $0.7 \mathrm{G}$
Magnetism and Matter

154097 A magnetic needle free to rotate in a vertical plane parallel to the magnetic meridian has its north tip pointing down at $30^{\circ}$ with the horizontal. The horizontal component of the earth's magnetic field at the place is $0.3 \mathrm{G}$. Then the magnitude of the earth's magnetic field at the location is

1 $\frac{\sqrt{3}}{5} \mathrm{G}$
2 $\sqrt{3} \mathrm{G}$
3 $\frac{20}{\sqrt{3}} \mathrm{G}$
4 $\frac{2}{\sqrt{3}} \mathrm{G}$
Magnetism and Matter

154099 The vertical component of the earth's magnetic field is $6 \times 10^{-5} \mathrm{~T}$ at any place where the angle of dip is $37^{\circ}$. The earth's resultant magnetic field at that place will be (Given $\tan 37^{\circ}=\frac{\mathbf{3}}{\mathbf{4}}$ )

1 $8 \times 10^{-5} \mathrm{~T}$
2 $6 \times 10^{-5} \mathrm{~T}$
3 $5 \times 10^{-4} \mathrm{~T}$
4 $1 \times 10^{-4} \mathrm{~T}$
Magnetism and Matter

154094 A vibration magnetometer is used at two different places $A$ and $B$ on the earth. The time period of a magnet suspended freely in the magnetometer at $A$ is twice that at $B$. If the horizontal component of the earth's magnetic field at $B$ is $32 \times 10^{-6} \mathrm{~T}$, then its value at $A$ is

1 $\mathrm{H}_{\mathrm{A}}=8 \times 10^{-6} \mathrm{~T}$
2 $\mathrm{H}_{\mathrm{A}}=32 \times 10^{-6} \mathrm{~T}$
3 $\mathrm{H}_{\mathrm{A}}=4 \times 10^{-6} \mathrm{~T}$
4 $\mathrm{H}_{\mathrm{A}}=16 \times 10^{-6} \mathrm{~T}$
Magnetism and Matter

154095 If a bar magnet is cut along the dotted line as shown in the figure and the two pieces are held separated by a small distance as they are, then

1 They repel each other.
2 They attract each other.
3 They do not experience any force on each other.
4 Will repel or attract depending on the location of cut.
Magnetism and Matter

154096 On the magnetic meridian at some place of the Earth's surface the vertical component of the earth's magnetic field is $0.433 \mathrm{G}$ and the dip angle is $60^{\circ}$. Then the magnetic field of the earth at this place is

1 $0.5 \mathrm{G}$
2 $1.4 \mathrm{G}$
3 $1.7 \mathrm{G}$
4 $0.7 \mathrm{G}$
Magnetism and Matter

154097 A magnetic needle free to rotate in a vertical plane parallel to the magnetic meridian has its north tip pointing down at $30^{\circ}$ with the horizontal. The horizontal component of the earth's magnetic field at the place is $0.3 \mathrm{G}$. Then the magnitude of the earth's magnetic field at the location is

1 $\frac{\sqrt{3}}{5} \mathrm{G}$
2 $\sqrt{3} \mathrm{G}$
3 $\frac{20}{\sqrt{3}} \mathrm{G}$
4 $\frac{2}{\sqrt{3}} \mathrm{G}$
Magnetism and Matter

154099 The vertical component of the earth's magnetic field is $6 \times 10^{-5} \mathrm{~T}$ at any place where the angle of dip is $37^{\circ}$. The earth's resultant magnetic field at that place will be (Given $\tan 37^{\circ}=\frac{\mathbf{3}}{\mathbf{4}}$ )

1 $8 \times 10^{-5} \mathrm{~T}$
2 $6 \times 10^{-5} \mathrm{~T}$
3 $5 \times 10^{-4} \mathrm{~T}$
4 $1 \times 10^{-4} \mathrm{~T}$
Magnetism and Matter

154094 A vibration magnetometer is used at two different places $A$ and $B$ on the earth. The time period of a magnet suspended freely in the magnetometer at $A$ is twice that at $B$. If the horizontal component of the earth's magnetic field at $B$ is $32 \times 10^{-6} \mathrm{~T}$, then its value at $A$ is

1 $\mathrm{H}_{\mathrm{A}}=8 \times 10^{-6} \mathrm{~T}$
2 $\mathrm{H}_{\mathrm{A}}=32 \times 10^{-6} \mathrm{~T}$
3 $\mathrm{H}_{\mathrm{A}}=4 \times 10^{-6} \mathrm{~T}$
4 $\mathrm{H}_{\mathrm{A}}=16 \times 10^{-6} \mathrm{~T}$
Magnetism and Matter

154095 If a bar magnet is cut along the dotted line as shown in the figure and the two pieces are held separated by a small distance as they are, then

1 They repel each other.
2 They attract each other.
3 They do not experience any force on each other.
4 Will repel or attract depending on the location of cut.
Magnetism and Matter

154096 On the magnetic meridian at some place of the Earth's surface the vertical component of the earth's magnetic field is $0.433 \mathrm{G}$ and the dip angle is $60^{\circ}$. Then the magnetic field of the earth at this place is

1 $0.5 \mathrm{G}$
2 $1.4 \mathrm{G}$
3 $1.7 \mathrm{G}$
4 $0.7 \mathrm{G}$
Magnetism and Matter

154097 A magnetic needle free to rotate in a vertical plane parallel to the magnetic meridian has its north tip pointing down at $30^{\circ}$ with the horizontal. The horizontal component of the earth's magnetic field at the place is $0.3 \mathrm{G}$. Then the magnitude of the earth's magnetic field at the location is

1 $\frac{\sqrt{3}}{5} \mathrm{G}$
2 $\sqrt{3} \mathrm{G}$
3 $\frac{20}{\sqrt{3}} \mathrm{G}$
4 $\frac{2}{\sqrt{3}} \mathrm{G}$
Magnetism and Matter

154099 The vertical component of the earth's magnetic field is $6 \times 10^{-5} \mathrm{~T}$ at any place where the angle of dip is $37^{\circ}$. The earth's resultant magnetic field at that place will be (Given $\tan 37^{\circ}=\frac{\mathbf{3}}{\mathbf{4}}$ )

1 $8 \times 10^{-5} \mathrm{~T}$
2 $6 \times 10^{-5} \mathrm{~T}$
3 $5 \times 10^{-4} \mathrm{~T}$
4 $1 \times 10^{-4} \mathrm{~T}$
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Magnetism and Matter

154094 A vibration magnetometer is used at two different places $A$ and $B$ on the earth. The time period of a magnet suspended freely in the magnetometer at $A$ is twice that at $B$. If the horizontal component of the earth's magnetic field at $B$ is $32 \times 10^{-6} \mathrm{~T}$, then its value at $A$ is

1 $\mathrm{H}_{\mathrm{A}}=8 \times 10^{-6} \mathrm{~T}$
2 $\mathrm{H}_{\mathrm{A}}=32 \times 10^{-6} \mathrm{~T}$
3 $\mathrm{H}_{\mathrm{A}}=4 \times 10^{-6} \mathrm{~T}$
4 $\mathrm{H}_{\mathrm{A}}=16 \times 10^{-6} \mathrm{~T}$
Magnetism and Matter

154095 If a bar magnet is cut along the dotted line as shown in the figure and the two pieces are held separated by a small distance as they are, then

1 They repel each other.
2 They attract each other.
3 They do not experience any force on each other.
4 Will repel or attract depending on the location of cut.
Magnetism and Matter

154096 On the magnetic meridian at some place of the Earth's surface the vertical component of the earth's magnetic field is $0.433 \mathrm{G}$ and the dip angle is $60^{\circ}$. Then the magnetic field of the earth at this place is

1 $0.5 \mathrm{G}$
2 $1.4 \mathrm{G}$
3 $1.7 \mathrm{G}$
4 $0.7 \mathrm{G}$
Magnetism and Matter

154097 A magnetic needle free to rotate in a vertical plane parallel to the magnetic meridian has its north tip pointing down at $30^{\circ}$ with the horizontal. The horizontal component of the earth's magnetic field at the place is $0.3 \mathrm{G}$. Then the magnitude of the earth's magnetic field at the location is

1 $\frac{\sqrt{3}}{5} \mathrm{G}$
2 $\sqrt{3} \mathrm{G}$
3 $\frac{20}{\sqrt{3}} \mathrm{G}$
4 $\frac{2}{\sqrt{3}} \mathrm{G}$
Magnetism and Matter

154099 The vertical component of the earth's magnetic field is $6 \times 10^{-5} \mathrm{~T}$ at any place where the angle of dip is $37^{\circ}$. The earth's resultant magnetic field at that place will be (Given $\tan 37^{\circ}=\frac{\mathbf{3}}{\mathbf{4}}$ )

1 $8 \times 10^{-5} \mathrm{~T}$
2 $6 \times 10^{-5} \mathrm{~T}$
3 $5 \times 10^{-4} \mathrm{~T}$
4 $1 \times 10^{-4} \mathrm{~T}$
Magnetism and Matter

154094 A vibration magnetometer is used at two different places $A$ and $B$ on the earth. The time period of a magnet suspended freely in the magnetometer at $A$ is twice that at $B$. If the horizontal component of the earth's magnetic field at $B$ is $32 \times 10^{-6} \mathrm{~T}$, then its value at $A$ is

1 $\mathrm{H}_{\mathrm{A}}=8 \times 10^{-6} \mathrm{~T}$
2 $\mathrm{H}_{\mathrm{A}}=32 \times 10^{-6} \mathrm{~T}$
3 $\mathrm{H}_{\mathrm{A}}=4 \times 10^{-6} \mathrm{~T}$
4 $\mathrm{H}_{\mathrm{A}}=16 \times 10^{-6} \mathrm{~T}$
Magnetism and Matter

154095 If a bar magnet is cut along the dotted line as shown in the figure and the two pieces are held separated by a small distance as they are, then

1 They repel each other.
2 They attract each other.
3 They do not experience any force on each other.
4 Will repel or attract depending on the location of cut.
Magnetism and Matter

154096 On the magnetic meridian at some place of the Earth's surface the vertical component of the earth's magnetic field is $0.433 \mathrm{G}$ and the dip angle is $60^{\circ}$. Then the magnetic field of the earth at this place is

1 $0.5 \mathrm{G}$
2 $1.4 \mathrm{G}$
3 $1.7 \mathrm{G}$
4 $0.7 \mathrm{G}$
Magnetism and Matter

154097 A magnetic needle free to rotate in a vertical plane parallel to the magnetic meridian has its north tip pointing down at $30^{\circ}$ with the horizontal. The horizontal component of the earth's magnetic field at the place is $0.3 \mathrm{G}$. Then the magnitude of the earth's magnetic field at the location is

1 $\frac{\sqrt{3}}{5} \mathrm{G}$
2 $\sqrt{3} \mathrm{G}$
3 $\frac{20}{\sqrt{3}} \mathrm{G}$
4 $\frac{2}{\sqrt{3}} \mathrm{G}$
Magnetism and Matter

154099 The vertical component of the earth's magnetic field is $6 \times 10^{-5} \mathrm{~T}$ at any place where the angle of dip is $37^{\circ}$. The earth's resultant magnetic field at that place will be (Given $\tan 37^{\circ}=\frac{\mathbf{3}}{\mathbf{4}}$ )

1 $8 \times 10^{-5} \mathrm{~T}$
2 $6 \times 10^{-5} \mathrm{~T}$
3 $5 \times 10^{-4} \mathrm{~T}$
4 $1 \times 10^{-4} \mathrm{~T}$