AIEEE 2006 | Magnetic Properties of Matter Question 64 | Physics

Needles $${N_1}$$, $${N_2}$$ and $${N_3}$$ are made of ferromagnetic, a paramagnetic and a diamagnetic substance respectively. A magnet when brought close to them will

attract $${N_1}$$ and $${N_2}$$ strongly but repel $${N_3}$$

attract $${N_1}$$ strongly, $${N_2}$$ weakly and repel $${N_3}$$ weakly

attract $${N_1}$$ strongly, but repel $${N_2}$$ and $${N_3}$$ weakly

attract all three of them

AIEEE 2005

MCQ (Single Correct Answer)

-1

A magnetic needle is kept in a non-uniform magnetic field. It experiences :

neither a force nor a torque

a torque but not a force

a force but not a torque

a force and a torque

AIEEE 2004

MCQ (Single Correct Answer)

-1

The length of a magnet is large compared to its width and breadth. The time period of its oscillation in a vibration magnetometer is $$2s.$$ The magnet is cut along its length into three equal parts and these parts are then placed on each other with their like poles together. The time period of this combination will be

$$2\sqrt 3 \,s$$

$${2 \over 3}\,\,s$$

$$2\,s$$

$${2 \over {\sqrt 3 }}\,s$$

AIEEE 2004

MCQ (Single Correct Answer)

-1

The materials suitable for making electromagnets should have

high retentivity and low coercivity

low retentivity and low coercivity

high retentivity and high coercivity

low retentivity and high coercivity