1
AIEEE 2004
MCQ (Single Correct Answer)
+4
-1
The materials suitable for making electromagnets should have
A
high retentivity and low coercivity
B
low retentivity and low coercivity
C
high retentivity and high coercivity
D
low retentivity and high coercivity
2
AIEEE 2004
MCQ (Single Correct Answer)
+4
-1
Curie temperature is the temperature above which
A
a ferromagnetic material becomes paramagnetic
B
a paramagnetic material becomes diamagnetic
C
a ferromagnetic material becomes diamagnetic
D
a paramagnetic material becomes ferromagnetic
3
AIEEE 2003
MCQ (Single Correct Answer)
+4
-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 :
A
$$\sqrt 3 \,W$$
B
$$W$$
C
$${{\sqrt 3 } \over 2}W$$
D
$$2W$$
4
AIEEE 2003
MCQ (Single Correct Answer)
+4
-1
Out of Syllabus
A thin rectangular magnet suspended freely has a period of oscillation equal to $$T.$$ Now it is broken into two equal halves (each having half of the original length) and one piece is made to oscillate freely in the same field. If its period of oscillation is $$T',$$ the ratio $${{T'} \over T}$$ is
A
$${1 \over {2\sqrt 2 }}$$
B
$${1 \over 2}$$
C
$$2$$
D
$${1 \over 4}$$
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