The magnetic susceptibility is negative for:
1. paramagnetic material only
2. ferromagnetic material only
3. paramagnetic and ferromagnetic materials
4. diamagnetic material only

Subtopic:  Magnetic Materials |
 87%
From NCERT
NEET - 2016
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The following figures show the arrangement of bar magnets in different configurations. Each magnet has a magnetic dipole. Which configuration has the highest net magnetic dipole moment?

1. 2.
3. 4.
Subtopic:  Bar Magnet |
 70%
From NCERT
AIPMT - 2014
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A bar magnet of length \(‘l’\) and magnetic dipole moment \(‘M’\) is bent in the form of an arc as shown in the figure. The new magnetic dipole moment will be:

1. \(\frac{3M}{\pi}\) 2. \(\frac{2M}{l\pi}\)
3. \(\frac{M}{ 2}\) 4. \(M\)
Subtopic:  Bar Magnet |
 78%
From NCERT
AIPMT - 2013
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A compass needle which is allowed to move in a horizontal plane is taken to a geomagnetic pole. It:

1. will become rigid showing no movement

2. will stay in any position

3. will stay in north-south direction only

4. will stay in east-west direction only

Subtopic:  Earth's Magnetism (OLD NCERT) |
From NCERT
AIPMT - 2012
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Curie temperature is the temperature above which:
1. Ferromagnetic material becomes paramagnetic material.
2. Paramagnetic material becomes diamagnetic material.
3. Paramagnetic material becomes ferromagnetic material.
4. Ferromagnetic material becomes diamagnetic material.
Subtopic:  Curie's Law and Hysteresis (OLD NCERT) |
 82%
From NCERT
AIPMT - 2008
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Nickel shows the ferromagnetic property at room temperature. If the temperature is increased beyond Curie's temperature, then it will show:
1. paramagnetism
2. anti-ferromagnetism
3. no magnetic property
4. diamagnetism

Subtopic:  Magnetic Materials |
 88%
From NCERT
AIPMT - 2007
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Above Curie temperature:

1. a ferromagnetic substance becomes paramagnetic.

2. a paramagnetic substance becomes diamagnetic.

3. a diamagnetic substance becomes paramagnetic.

4. a paramagnetic substance becomes ferromagnetic.

Subtopic:  Curie's Law and Hysteresis (OLD NCERT) |
 82%
From NCERT
AIPMT - 2006
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At point A on the earth's surface, the angle of dip is, δ=+25°. At a point B on the earth's surface, the angle of dip is, δ=-25°. We can interpret that:

1. A and B are both located in the southern hemisphere.
2. A and B are both located in the northern hemisphere.
3. A is located in the southern hemisphere and B is located in the northern hemisphere.
4. A is located in the northern hemisphere and B is located in the southern hemisphere.
Subtopic:  Earth's Magnetism (OLD NCERT) |
 70%
From NCERT
NEET - 2019
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A thin diamagnetic rod is placed vertically between the poles of an electromagnet. When the current in the electromagnet is switched on, then the diamagnetic rod is pushed up, out of the horizontal magnetic field. Hence the rod gains gravitational potential energy. The work required to do this comes from:

1. the current source
2. the magnetic field
3. the lattice structure of the material of the rod
4. the induced electric field due to the changing magnetic field.
Subtopic:  Magnetic Materials |
From NCERT
NEET - 2018
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A bar magnet is hung by a thin cotton thread in a uniform horizontal magnetic field and is in the 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:
1. \(\frac{W}{\sqrt{3}}\)
2. \(\sqrt{3}W\)
3. \(\frac{\sqrt{3}W}{2}\)
4. \(\frac{2W}{\sqrt{3}}\)

Subtopic:  Analogy between Electrostatics & Magnetostatics |
 77%
From NCERT
NEET - 2016
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