A magnetic needle kept on horizontal sur...

A magnetic needle kept on horizontal surface oscillates in Earth's magnetic field. If the temperature of this needle is raised beyond the Curie temperature of the material of the needle, then ........ .

the periodic time of oscillation will decrease.

the periodic time of oscillation will increase.

the periodic time of the oscillation will not change.

the needle will stop oscillating.

Text Solution

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The correct Answer is:

As the temperature of ferromagnetic substance is increased the domain structure starts getting deslurted. AL a certain temperature depending upon the material, it is totally broken up. Each and every atomic magnetic moment attains independence from one another and the substance gets converted to a paramagnetic material, and hence oscillations will stop.

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