1
AIEEE 2003
MCQ (Single Correct Answer)
+4
-1
A particle of mass $$M$$ and charge $$Q$$ moving with velocity $$\overrightarrow v $$ describe a circular path of radius $$R$$ when subjected to a uniform transverse magnetic field of induction $$B.$$ The network done by the field when the particle completes one full circle is
A
$$\left( {{{M{v^2}} \over R}} \right)2\pi R$$
B
zero
C
$$B\,\,Q\,2\pi R$$
D
$$B\,Qv\,2\pi R$$
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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