AIEEE 2004 | Magnetic Properties of Matter Question 60 | Physics

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

AIEEE 2004

MCQ (Single Correct Answer)

-1

Curie temperature is the temperature above which

a ferromagnetic material becomes paramagnetic

a paramagnetic material becomes diamagnetic

a ferromagnetic material becomes diamagnetic

a paramagnetic material becomes ferromagnetic

AIEEE 2003

MCQ (Single Correct Answer)

-1

A magnetic needle lying parallel to a magnetic field requires $$W$$ units of work to turn it through $${60^ \circ }.$$ The torque needed to maintain the needle in this position will be :

$$\sqrt 3 \,W$$

$$W$$

$${{\sqrt 3 } \over 2}W$$

$$2W$$

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