Question:

A magnetic needle suspended by a silk thread is vibrating in the earth?s magnetic field. If the temperature of the needle is increased by $700^{\circ}C$, then

Updated On: Jun 23, 2023
  • time period decreases
  • time period increases
  • time period remains unchanged
  • the needle stops vibrating
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The Correct Option is B

Solution and Explanation

On increasing the temperature by $700^{\circ}C$, the magnetic needle is demagnetised. Therefore, the needle stops vibrating.
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Notes on Magnetism and matter

Concepts Used:

Magnetism & Matter

Magnets are used in many devices like electric bells, telephones, radio, loudspeakers, motors, fans, screwdrivers, lifting heavy iron loads, super-fast trains, especially in foreign countries, refrigerators, etc.

Magnetite is the world’s first magnet. This is also called a natural magnet.  Though magnets occur naturally, we can also impart magnetic properties to a substance. It would be an artificial magnet in that case.

Read More: Magnetism and Matter

Some of the properties of the magnetic field lines are:

  • The lines and continuous and outside the magnet, the field lines originate from the North pole and terminate at the South pole
  • They form closed loops traversing inside the magnet. 
  • But here the lines seem to originate from the South pole and terminate at the North pole to form closed loops.
  • More number of close lines indicate a stronger magnetic field
  • The lines do not intersect each other
  • The tangent drawn at the field line gives the direction of the field at that point.