Needles N1,N2,and N3 are made of a ferromagnetic, a paramagnetic and a diamagnetic substance respectively. A magnet when brought close to them will

  • Option 1)

    attract all three of them

  • Option 2)

    attract N1 and N2 strongly but repel N3

  • Option 3)

    attract  N1 strongly, N2 weakly and repel N3 weakly

  • Option 4)

    attract N1 strongly, but repel N2 and N3 weakly.

 

Answers (1)

As we learnt in

Behaviour in a non- uniform magnetic field -

These are strongly attracted in an external magnetic field (in ferromagnetic substance)

- wherein

 

 

Behaviour in a non-uniform magnetic field -

These are feebly attracted in an external magnetic field (in paramagnetic substance)

- wherein

 

 

Behaviour in a non uniform magnetic field -

These are repelled in an external magnetic field. (In diamagnetic substance)

- wherein

 

 

Magnet will attract N1 strongly, N2 weakly and repel N3 weakly .


Option 1)

attract all three of them

Incorrect

Option 2)

attract N1 and N2 strongly but repel N3

Incorrect

Option 3)

attract  N1 strongly, N2 weakly and repel N3 weakly

Correct

Option 4)

attract N1 strongly, but repel N2 and N3 weakly.

Incorrect

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