JEE Main · 2006 · 30 Apr 2006 · Offline · Magnetic Properties of Matter

Needles

N_{1}

N_{2}

and

N_{3}

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 $N_{1}$ and $N_{2}$ strongly but repel $N_{3}$
(C)attract $N_{1}$ strongly, $N_{2}$ weakly and repel $N_{3}$ weakly✓ Correct
(D)attract $N_{1}$ strongly, but repel $N_{2}$ and $N_{3}$ weakly

Answer: (C)

Solution

A ferromagnetic material is very strongly attracted by a magnet, a paramagnetic material is only weakly attracted, and a diamagnetic material is weakly repelled because it magnetises opposite to the applied field. So the ferromagnetic needle

N_{1}

is drawn in strongly, the paramagnetic

N_{2}

is drawn in weakly, and the diamagnetic

N_{3}

is pushed away weakly.

JEE Main · 2006 · 30 Apr 2006 · Offline · Single correct option

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JEE Main · 2006 · 30 Apr 2006 · Offline · Magnetic Properties of Matter

Solution

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