1
NEET 2013
MCQ (Single Correct Answer)
+4
-1
Change Language
A bar magnet of length $$'l'$$ and magnetic dipole moment 'M' is bent in the form of an arc as shown in figure. The new magnetic dipole moment will be

NEET 2013 Physics - Magnetism and Matter Question 40 English
A
$${2 \over \pi }M$$
B
$${M \over 2}$$
C
M
D
$${3 \over \pi }M$$
2
AIPMT 2012 Mains
MCQ (Single Correct Answer)
+4
-1
Change Language
A magnetic needle suspended parallel to a magnetic field requires $$\sqrt 3 J$$ of work to turn it through 60o. The torque needed to maintain the needle in this position will be
A
$$2\sqrt 3 J$$
B
$$3$$ $$J$$
C
$$\sqrt 3 \,J$$
D
$${3 \over 2}\,J$$
3
AIPMT 2012 Prelims
MCQ (Single Correct Answer)
+4
-1
Change Language
A compass needle which is allowed to move in a horizontal plane is taken to a geomagnetic pole. It
A
will become rigif showing no movement
B
will stay in any position
C
will stay in north-south direction only
D
will stay in east-west direction only
4
AIPMT 2011 Mains
MCQ (Single Correct Answer)
+4
-1
A short bar magnet of magnetic moment 0.4 J T$$-$$1 is placed in a uniform magnetic field of 0.16 T. The magnet is in stable equilibrium when the potential energy is
A
0.064 J
B
$$-$$ 0.064 J
C
zero
D
$$-$$ 0.082 J
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