Magnetism And Matter

Physics
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A magnetic dipole in a constant magnetic field has ;

A
Minimum potential energy when the torque is maximum.
B
Zero potential energy when the torque is minimum.
C
Zero potential energy when the torque is maximum.
D
Maximum potential energy when the torque is maximum.
Medium
JEE Mains
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Curie temperature is the temperature above which

A
a ferromagnetic material becomes paramagnetic
B
a paramagnetic material becomes diamagnetic
C
a ferromagnetic material becomes diamagnetic
D
a paramagnetic material becomes ferromagnetic.
Medium
JEE Mains
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Needles  and  are made of a ferromagnetic, a paramagnetic and a diamagnetic substance respectively. A magnet when brought close to them will 

A
attract all three of them.
B
attract and strongly but repel
C
attract strongly, weakly and repel weakly.
D
attract strongly, but repel and weakly.
Medium
JEE Mains
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