1
AIPMT 2005
MCQ (Single Correct Answer)
+4
-1
An electron moves in a circular orbit with a uniform speed v. It producess a magnetic field B at the centre of the circle. The radius of the circle is proportional to
A
$$\sqrt {B/v} $$
B
$$B/v$$
C
$$\sqrt {v/B} $$
D
$$v/B$$
2
AIPMT 2005
MCQ (Single Correct Answer)
+4
-1
A very long straight wire carries a current $$I$$. At the instant when a charge +Q at point P has velocity $$\overrightarrow v $$, as shown, the force on the charge is

AIPMT 2005 Physics - Moving Charges and Magnetism Question 30 English
A
along Oy
B
opposite to Oy
C
along Ox
D
opposite to Ox
3
AIPMT 2005
MCQ (Single Correct Answer)
+4
-1
A coil in the shape of an equilateral triangle of side $$l$$ is suspended between the pole pieces of a permanent magnet such that $$\overrightarrow B $$ is in plane of the coil. If due to a current i in the triangle a torque $$\tau $$ acts on it, the side $$l$$ of the triangle is
A
$${2 \over {\sqrt 3 }}\left( {{\tau \over {Bi}}} \right)$$
B
$$2{\left( {{\tau \over {\sqrt 3 Bi}}} \right)^{1/2}}$$
C
$${2 \over {\sqrt 3 }}{\left( {{\tau \over {Bi}}} \right)^{1/2}}$$
D
$${1 \over {\sqrt 3 }}{\tau \over {Bi}}$$
4
AIPMT 2005
MCQ (Single Correct Answer)
+4
-1
If the magnetic dipole moment of an atom of diamagnetic material, paramagnetic material and ferromagnetic material are denoted by $$\mu $$d, $$\mu $$p and $$\mu $$f respectively, then
A
$${\mu _d} = 0$$ and $$\mu $$p $$ \ne $$ 0
B
$$\mu $$d $$ \ne $$ 0 and $$\mu $$p = 0
C
$$\mu $$p = 0 and $$\mu $$f $$ \ne $$ 0
D
$$\mu $$d $$ \ne $$ 0 and $$\mu $$f $$ \ne $$ 0.
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