1
AIEEE 2003
MCQ (Single Correct Answer)
+4
-1
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
$${1 \over 4}$$
2
AIEEE 2003
MCQ (Single Correct Answer)
+4
-1
A particle of charge $$ - 16 \times {10^{ - 18}}$$ coulomb moving with velocity $$10m{s^{ - 1}}$$ along the $$x$$-axis enters a region where a magnetic field of induction $$B$$ is along the $$y$$-axis, and an electric field of magnitude $${10^4}V/m$$ is along the negative $$z$$-axis. If the charged particle continues moving along the $$x$$-axis, the magnitude of $$B$$ is
A
$${10^3}Wb/{m^2}$$
B
$${10^5}Wb/{m^2}$$
C
$${10^{16}}Wb/{m^2}$$
D
$${10^{ - 3}}Wb/{m^2}$$
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
The magnetic lines of force inside a bar magnet
A
are from north-pole to south-pole of the magnet
B
do not exist
C
depend upon the area of cross-section of the bar magnet
D
are from south-pole to north-pole of the Magnet
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