00. Magnet and Magnetic Dipole
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Magnetism and Matter

154002 $\alpha$ particle is revolving in a circle of radius $r$ with speed $v$ then find value of magnetic dipole moment.

1 2 evr
2 evr
3 3 evr
4 4 evr
AIIMS-26.05.2019(E) Shift-2
Magnetism and Matter

154003 In a deflection magnetometer, the time period of a magnet is found to be 8 sec. If the magnetic moment of another magnet is $1 \backslash 4$ of the first one, what is the time period of the latter?

1 $8 \mathrm{sec}$
2 $4 \mathrm{sec}$
3 $2 \mathrm{sec}$
4 $16 \mathrm{sec}$
COMEDK 2019
Magnetism and Matter

154004 A small bar magnet experiences a torque of $0.016 \mathrm{Nm}$ when placed with its axis at $30^{\circ}$ with an external field of $0.04 \mathrm{~T}$. If the bar magnet is replaced by a solenoid of cross-sectional area of $1 \mathrm{~cm}^{2}$ and 1000 turns but having the same magnetic moment as that of bar magnet, then the current flowing through the solenoid is

1 $2 \mathrm{~A}$
2 $4 \mathrm{~A}$
3 $6 \mathrm{~A}$
4 $8 \mathrm{~A}$
TS- EAMCET-04.05.2019
Magnetism and Matter

154005 A thin wire of length ' $L$ ' made of an insulating material is bent to form a circular loop and a positive charge ' $q$ ' is given so that it is distributed uniformly around the circumference of the loop. The loop is then rotated with an angular speed ' $\omega$ ' about an axis passing through its centre. If a uniform magnetic field $B$ directed parallel to the plane of the loop is applied then the magnitude of the magnetic torque on the loop is

1 $\frac{q \omega \mathrm{L}^{2} \mathrm{~B}}{8 \pi^{2}}$
2 $\frac{q \omega L^{2} B}{4 \pi^{2}}$
3 $\frac{q \omega \mathrm{L}^{2} \mathrm{~B}}{2 \pi^{2}}$
4 $\frac{q \omega L^{2} B}{\pi^{2}}$
AP EAMCET-24.04.2018
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Magnetism and Matter

154002 $\alpha$ particle is revolving in a circle of radius $r$ with speed $v$ then find value of magnetic dipole moment.

1 2 evr
2 evr
3 3 evr
4 4 evr
AIIMS-26.05.2019(E) Shift-2
Magnetism and Matter

154003 In a deflection magnetometer, the time period of a magnet is found to be 8 sec. If the magnetic moment of another magnet is $1 \backslash 4$ of the first one, what is the time period of the latter?

1 $8 \mathrm{sec}$
2 $4 \mathrm{sec}$
3 $2 \mathrm{sec}$
4 $16 \mathrm{sec}$
COMEDK 2019
Magnetism and Matter

154004 A small bar magnet experiences a torque of $0.016 \mathrm{Nm}$ when placed with its axis at $30^{\circ}$ with an external field of $0.04 \mathrm{~T}$. If the bar magnet is replaced by a solenoid of cross-sectional area of $1 \mathrm{~cm}^{2}$ and 1000 turns but having the same magnetic moment as that of bar magnet, then the current flowing through the solenoid is

1 $2 \mathrm{~A}$
2 $4 \mathrm{~A}$
3 $6 \mathrm{~A}$
4 $8 \mathrm{~A}$
TS- EAMCET-04.05.2019
Magnetism and Matter

154005 A thin wire of length ' $L$ ' made of an insulating material is bent to form a circular loop and a positive charge ' $q$ ' is given so that it is distributed uniformly around the circumference of the loop. The loop is then rotated with an angular speed ' $\omega$ ' about an axis passing through its centre. If a uniform magnetic field $B$ directed parallel to the plane of the loop is applied then the magnitude of the magnetic torque on the loop is

1 $\frac{q \omega \mathrm{L}^{2} \mathrm{~B}}{8 \pi^{2}}$
2 $\frac{q \omega L^{2} B}{4 \pi^{2}}$
3 $\frac{q \omega \mathrm{L}^{2} \mathrm{~B}}{2 \pi^{2}}$
4 $\frac{q \omega L^{2} B}{\pi^{2}}$
AP EAMCET-24.04.2018
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Magnetism and Matter

154002 $\alpha$ particle is revolving in a circle of radius $r$ with speed $v$ then find value of magnetic dipole moment.

1 2 evr
2 evr
3 3 evr
4 4 evr
AIIMS-26.05.2019(E) Shift-2
Magnetism and Matter

154003 In a deflection magnetometer, the time period of a magnet is found to be 8 sec. If the magnetic moment of another magnet is $1 \backslash 4$ of the first one, what is the time period of the latter?

1 $8 \mathrm{sec}$
2 $4 \mathrm{sec}$
3 $2 \mathrm{sec}$
4 $16 \mathrm{sec}$
COMEDK 2019
Magnetism and Matter

154004 A small bar magnet experiences a torque of $0.016 \mathrm{Nm}$ when placed with its axis at $30^{\circ}$ with an external field of $0.04 \mathrm{~T}$. If the bar magnet is replaced by a solenoid of cross-sectional area of $1 \mathrm{~cm}^{2}$ and 1000 turns but having the same magnetic moment as that of bar magnet, then the current flowing through the solenoid is

1 $2 \mathrm{~A}$
2 $4 \mathrm{~A}$
3 $6 \mathrm{~A}$
4 $8 \mathrm{~A}$
TS- EAMCET-04.05.2019
Magnetism and Matter

154005 A thin wire of length ' $L$ ' made of an insulating material is bent to form a circular loop and a positive charge ' $q$ ' is given so that it is distributed uniformly around the circumference of the loop. The loop is then rotated with an angular speed ' $\omega$ ' about an axis passing through its centre. If a uniform magnetic field $B$ directed parallel to the plane of the loop is applied then the magnitude of the magnetic torque on the loop is

1 $\frac{q \omega \mathrm{L}^{2} \mathrm{~B}}{8 \pi^{2}}$
2 $\frac{q \omega L^{2} B}{4 \pi^{2}}$
3 $\frac{q \omega \mathrm{L}^{2} \mathrm{~B}}{2 \pi^{2}}$
4 $\frac{q \omega L^{2} B}{\pi^{2}}$
AP EAMCET-24.04.2018
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Magnetism and Matter

154002 $\alpha$ particle is revolving in a circle of radius $r$ with speed $v$ then find value of magnetic dipole moment.

1 2 evr
2 evr
3 3 evr
4 4 evr
AIIMS-26.05.2019(E) Shift-2
Magnetism and Matter

154003 In a deflection magnetometer, the time period of a magnet is found to be 8 sec. If the magnetic moment of another magnet is $1 \backslash 4$ of the first one, what is the time period of the latter?

1 $8 \mathrm{sec}$
2 $4 \mathrm{sec}$
3 $2 \mathrm{sec}$
4 $16 \mathrm{sec}$
COMEDK 2019
Magnetism and Matter

154004 A small bar magnet experiences a torque of $0.016 \mathrm{Nm}$ when placed with its axis at $30^{\circ}$ with an external field of $0.04 \mathrm{~T}$. If the bar magnet is replaced by a solenoid of cross-sectional area of $1 \mathrm{~cm}^{2}$ and 1000 turns but having the same magnetic moment as that of bar magnet, then the current flowing through the solenoid is

1 $2 \mathrm{~A}$
2 $4 \mathrm{~A}$
3 $6 \mathrm{~A}$
4 $8 \mathrm{~A}$
TS- EAMCET-04.05.2019
Magnetism and Matter

154005 A thin wire of length ' $L$ ' made of an insulating material is bent to form a circular loop and a positive charge ' $q$ ' is given so that it is distributed uniformly around the circumference of the loop. The loop is then rotated with an angular speed ' $\omega$ ' about an axis passing through its centre. If a uniform magnetic field $B$ directed parallel to the plane of the loop is applied then the magnitude of the magnetic torque on the loop is

1 $\frac{q \omega \mathrm{L}^{2} \mathrm{~B}}{8 \pi^{2}}$
2 $\frac{q \omega L^{2} B}{4 \pi^{2}}$
3 $\frac{q \omega \mathrm{L}^{2} \mathrm{~B}}{2 \pi^{2}}$
4 $\frac{q \omega L^{2} B}{\pi^{2}}$
AP EAMCET-24.04.2018