15) Which one of the following is NOT a property of a magnet ?

When suspended freely moves to a fixed position relative to North and South Pole of earth

Produces magnetism in a nearby magnetic substance by induction

Unlike poles repel each other and like poles attract each other

Attracts magnetic substances like iron and steel

Answer is:

Unlike poles repel each other and like poles attract each other

Lenz's law

Faraday's first law of electromagnetic induction

Faraday's second law of electromagnetic induction

Fleming's right hand rule

Answer is:

Each piece will become a separate magnet having north and south pole

Magnetic property will be destroyed in both the pieces completely

Longer piece only will have magnetic property with north and south pole on either end

One piece will have only north pole and the other piece will have only south pole

Answer is:

increase

decrease

becomes zero

remain same

Answer is:

Alnico

Manganese

Copper

Bismuth

Answer is:

Explanation:

Alnico is having higher retentivity of magnetism.