360422
Rate of change of torque \({\tau}\) with deflection \({\theta}\) is maximum for a magnet suspended freely in a uniform magnetic field of induction \({B}\), when
1 \({\theta=0^{\circ}}\)
2 \({\theta=45^{\circ}}\)
3 \({\theta=60^{\circ}}\)
4 \({\theta=90^{\circ}}\)
Explanation:
As \({t=M B \sin \theta}\) \({\dfrac{d \tau}{d \theta}=M B \cos \theta}\) It will be maximum, when \({\theta=0^{\circ}}\).
PHXII05:MAGNETISM and MATTER
360423
A bar magnet is hung by a thin cotton thread in a uniform horizontal magnetic field and is in equilibrium state. The energy required to rotate it by \(60^{\circ}\) is \(W\). Now the torque required to keep the magnet in this new position is
360424
Torques \(\tau_{1}\) and \(\tau_{2}\), are required for magnetic needle to remain perpendicular to the magnetic fields and at two different places. The ratio is:
360425
A magnetic needle is placed on a cork floating in a still lake in the northern hemisphere. Does the needle together with the cork move towards the north of the lake?
1 Yes
2 No
3 May or may not move
4 Nothing can be said
Explanation:
Magnetic needle is a dipole which is in the earth's uniform magnetic field and as a dipole in a uniform field, it does not experience any net force but may experience a couple. So the needle together with the cork will not translate, i.e. not move towards the north of the lake, but will rotate and set itself parallel to the field with its north pole pointing north.
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PHXII05:MAGNETISM and MATTER
360422
Rate of change of torque \({\tau}\) with deflection \({\theta}\) is maximum for a magnet suspended freely in a uniform magnetic field of induction \({B}\), when
1 \({\theta=0^{\circ}}\)
2 \({\theta=45^{\circ}}\)
3 \({\theta=60^{\circ}}\)
4 \({\theta=90^{\circ}}\)
Explanation:
As \({t=M B \sin \theta}\) \({\dfrac{d \tau}{d \theta}=M B \cos \theta}\) It will be maximum, when \({\theta=0^{\circ}}\).
PHXII05:MAGNETISM and MATTER
360423
A bar magnet is hung by a thin cotton thread in a uniform horizontal magnetic field and is in equilibrium state. The energy required to rotate it by \(60^{\circ}\) is \(W\). Now the torque required to keep the magnet in this new position is
360424
Torques \(\tau_{1}\) and \(\tau_{2}\), are required for magnetic needle to remain perpendicular to the magnetic fields and at two different places. The ratio is:
360425
A magnetic needle is placed on a cork floating in a still lake in the northern hemisphere. Does the needle together with the cork move towards the north of the lake?
1 Yes
2 No
3 May or may not move
4 Nothing can be said
Explanation:
Magnetic needle is a dipole which is in the earth's uniform magnetic field and as a dipole in a uniform field, it does not experience any net force but may experience a couple. So the needle together with the cork will not translate, i.e. not move towards the north of the lake, but will rotate and set itself parallel to the field with its north pole pointing north.
360422
Rate of change of torque \({\tau}\) with deflection \({\theta}\) is maximum for a magnet suspended freely in a uniform magnetic field of induction \({B}\), when
1 \({\theta=0^{\circ}}\)
2 \({\theta=45^{\circ}}\)
3 \({\theta=60^{\circ}}\)
4 \({\theta=90^{\circ}}\)
Explanation:
As \({t=M B \sin \theta}\) \({\dfrac{d \tau}{d \theta}=M B \cos \theta}\) It will be maximum, when \({\theta=0^{\circ}}\).
PHXII05:MAGNETISM and MATTER
360423
A bar magnet is hung by a thin cotton thread in a uniform horizontal magnetic field and is in equilibrium state. The energy required to rotate it by \(60^{\circ}\) is \(W\). Now the torque required to keep the magnet in this new position is
360424
Torques \(\tau_{1}\) and \(\tau_{2}\), are required for magnetic needle to remain perpendicular to the magnetic fields and at two different places. The ratio is:
360425
A magnetic needle is placed on a cork floating in a still lake in the northern hemisphere. Does the needle together with the cork move towards the north of the lake?
1 Yes
2 No
3 May or may not move
4 Nothing can be said
Explanation:
Magnetic needle is a dipole which is in the earth's uniform magnetic field and as a dipole in a uniform field, it does not experience any net force but may experience a couple. So the needle together with the cork will not translate, i.e. not move towards the north of the lake, but will rotate and set itself parallel to the field with its north pole pointing north.
360422
Rate of change of torque \({\tau}\) with deflection \({\theta}\) is maximum for a magnet suspended freely in a uniform magnetic field of induction \({B}\), when
1 \({\theta=0^{\circ}}\)
2 \({\theta=45^{\circ}}\)
3 \({\theta=60^{\circ}}\)
4 \({\theta=90^{\circ}}\)
Explanation:
As \({t=M B \sin \theta}\) \({\dfrac{d \tau}{d \theta}=M B \cos \theta}\) It will be maximum, when \({\theta=0^{\circ}}\).
PHXII05:MAGNETISM and MATTER
360423
A bar magnet is hung by a thin cotton thread in a uniform horizontal magnetic field and is in equilibrium state. The energy required to rotate it by \(60^{\circ}\) is \(W\). Now the torque required to keep the magnet in this new position is
360424
Torques \(\tau_{1}\) and \(\tau_{2}\), are required for magnetic needle to remain perpendicular to the magnetic fields and at two different places. The ratio is:
360425
A magnetic needle is placed on a cork floating in a still lake in the northern hemisphere. Does the needle together with the cork move towards the north of the lake?
1 Yes
2 No
3 May or may not move
4 Nothing can be said
Explanation:
Magnetic needle is a dipole which is in the earth's uniform magnetic field and as a dipole in a uniform field, it does not experience any net force but may experience a couple. So the needle together with the cork will not translate, i.e. not move towards the north of the lake, but will rotate and set itself parallel to the field with its north pole pointing north.