01. Earth Magnetism
Magnetism and Matter

154105 A planet has magnetic dipole moment of $27 \times$ $10^{22} \mathrm{Am}^{2}$. If the radius of the planet is $300 \mathrm{~km}$, what would be the magnetic field at its equator? $\frac{\mu_{0}}{4 \pi}=10^{-7}$

1 $1 \mathrm{~T}$
2 $27 \mathrm{~T}$
3 $11 \mathrm{~T}$
4 $30 \mathrm{~T}$
Magnetism and Matter

154106 A wheel with 20 metallic spokes each $40 \mathrm{~cm}$ long is rotated with a speed of $180 \mathrm{rev} / \mathrm{min}$ in a plane normal to the horizontal component of earth's magnetic field $H_{e}$ at a place. If $H_{e}$ is the magnitude of field is $0.4 \mathrm{G}$ (Gauss) at that place, the induced emf between the axle and the rim of the Wheel is

1 $192 \pi \times 10^{-7} \mathrm{~V}$
2 $256 \pi \times 10^{-7} \mathrm{~V}$
3 $148 \pi \times 10^{-7} \mathrm{~V}$
4 $110 \pi \times 10^{-7} \mathrm{~V}$
Magnetism and Matter

154107 In the magnetic meridian of a certain place, the horizontal component of the Earth's magnetic field is 86.6 G (Gauss) and the magnetic field of earth is $100 \mathrm{G}$ (Gauss). Then the dip angle is

1 $45^{\circ}$
2 $60^{\circ}$
3 $30^{\circ}$
4 $75^{\circ}$
Magnetism and Matter

154108 The vertical component of earth's magnetic field at a place is $\sqrt{3}$ times the horizontal component. The value of angle of dip at this place is

1 $60^{\circ}$
2 $45^{\circ}$
3 $30^{\circ}$
4 $29^{\circ}$
Magnetism and Matter

154105 A planet has magnetic dipole moment of $27 \times$ $10^{22} \mathrm{Am}^{2}$. If the radius of the planet is $300 \mathrm{~km}$, what would be the magnetic field at its equator? $\frac{\mu_{0}}{4 \pi}=10^{-7}$

1 $1 \mathrm{~T}$
2 $27 \mathrm{~T}$
3 $11 \mathrm{~T}$
4 $30 \mathrm{~T}$
Magnetism and Matter

154106 A wheel with 20 metallic spokes each $40 \mathrm{~cm}$ long is rotated with a speed of $180 \mathrm{rev} / \mathrm{min}$ in a plane normal to the horizontal component of earth's magnetic field $H_{e}$ at a place. If $H_{e}$ is the magnitude of field is $0.4 \mathrm{G}$ (Gauss) at that place, the induced emf between the axle and the rim of the Wheel is

1 $192 \pi \times 10^{-7} \mathrm{~V}$
2 $256 \pi \times 10^{-7} \mathrm{~V}$
3 $148 \pi \times 10^{-7} \mathrm{~V}$
4 $110 \pi \times 10^{-7} \mathrm{~V}$
Magnetism and Matter

154107 In the magnetic meridian of a certain place, the horizontal component of the Earth's magnetic field is 86.6 G (Gauss) and the magnetic field of earth is $100 \mathrm{G}$ (Gauss). Then the dip angle is

1 $45^{\circ}$
2 $60^{\circ}$
3 $30^{\circ}$
4 $75^{\circ}$
Magnetism and Matter

154108 The vertical component of earth's magnetic field at a place is $\sqrt{3}$ times the horizontal component. The value of angle of dip at this place is

1 $60^{\circ}$
2 $45^{\circ}$
3 $30^{\circ}$
4 $29^{\circ}$
Magnetism and Matter

154105 A planet has magnetic dipole moment of $27 \times$ $10^{22} \mathrm{Am}^{2}$. If the radius of the planet is $300 \mathrm{~km}$, what would be the magnetic field at its equator? $\frac{\mu_{0}}{4 \pi}=10^{-7}$

1 $1 \mathrm{~T}$
2 $27 \mathrm{~T}$
3 $11 \mathrm{~T}$
4 $30 \mathrm{~T}$
Magnetism and Matter

154106 A wheel with 20 metallic spokes each $40 \mathrm{~cm}$ long is rotated with a speed of $180 \mathrm{rev} / \mathrm{min}$ in a plane normal to the horizontal component of earth's magnetic field $H_{e}$ at a place. If $H_{e}$ is the magnitude of field is $0.4 \mathrm{G}$ (Gauss) at that place, the induced emf between the axle and the rim of the Wheel is

1 $192 \pi \times 10^{-7} \mathrm{~V}$
2 $256 \pi \times 10^{-7} \mathrm{~V}$
3 $148 \pi \times 10^{-7} \mathrm{~V}$
4 $110 \pi \times 10^{-7} \mathrm{~V}$
Magnetism and Matter

154107 In the magnetic meridian of a certain place, the horizontal component of the Earth's magnetic field is 86.6 G (Gauss) and the magnetic field of earth is $100 \mathrm{G}$ (Gauss). Then the dip angle is

1 $45^{\circ}$
2 $60^{\circ}$
3 $30^{\circ}$
4 $75^{\circ}$
Magnetism and Matter

154108 The vertical component of earth's magnetic field at a place is $\sqrt{3}$ times the horizontal component. The value of angle of dip at this place is

1 $60^{\circ}$
2 $45^{\circ}$
3 $30^{\circ}$
4 $29^{\circ}$
Magnetism and Matter

154105 A planet has magnetic dipole moment of $27 \times$ $10^{22} \mathrm{Am}^{2}$. If the radius of the planet is $300 \mathrm{~km}$, what would be the magnetic field at its equator? $\frac{\mu_{0}}{4 \pi}=10^{-7}$

1 $1 \mathrm{~T}$
2 $27 \mathrm{~T}$
3 $11 \mathrm{~T}$
4 $30 \mathrm{~T}$
Magnetism and Matter

154106 A wheel with 20 metallic spokes each $40 \mathrm{~cm}$ long is rotated with a speed of $180 \mathrm{rev} / \mathrm{min}$ in a plane normal to the horizontal component of earth's magnetic field $H_{e}$ at a place. If $H_{e}$ is the magnitude of field is $0.4 \mathrm{G}$ (Gauss) at that place, the induced emf between the axle and the rim of the Wheel is

1 $192 \pi \times 10^{-7} \mathrm{~V}$
2 $256 \pi \times 10^{-7} \mathrm{~V}$
3 $148 \pi \times 10^{-7} \mathrm{~V}$
4 $110 \pi \times 10^{-7} \mathrm{~V}$
Magnetism and Matter

154107 In the magnetic meridian of a certain place, the horizontal component of the Earth's magnetic field is 86.6 G (Gauss) and the magnetic field of earth is $100 \mathrm{G}$ (Gauss). Then the dip angle is

1 $45^{\circ}$
2 $60^{\circ}$
3 $30^{\circ}$
4 $75^{\circ}$
Magnetism and Matter

154108 The vertical component of earth's magnetic field at a place is $\sqrt{3}$ times the horizontal component. The value of angle of dip at this place is

1 $60^{\circ}$
2 $45^{\circ}$
3 $30^{\circ}$
4 $29^{\circ}$