The periods of oscillation of two magnets in the same field in the ratio 2:If their moment of inertia are equal, ratio of their magnetic moments is
0%
a) 1 : 2
0%
b) 1 : 4
100%
c)2 : 1
0%
d)4 : 1
Q.2.
When a magnet marked N - s is suspended in a horizontal position, so that it is free to rotate, the pole marked N shall point towards
0%
a) south pole of earth's magnet
100%
b) north pole of earth's magnet
0%
c) geographic N pole
0%
d) geographic S pole
Q.3.
The relative permeability of iron is of the order of ...
0%
a)1
0%
b) 104
100%
c)zero
0%
d)10-4
Q.4.
Curie's law state that
0%
a) magnetic susceptibility is inversely proportional to the absolute temperature
100%
b) magnetic susceptibility is inversely proportional the square root of the absolute temperature
0%
c)magnetic susceptibility is directly proportional to the absolute temperature
0%
d)magnetic susceptibility is independent of temperature
Q.5.
The permanent magnetic moment of atoms or molecules of a diamagnetic material is
0%
a) small
100%
b) large
0%
c)negative
0%
d)zero
Q.6.
The relation between magnetic susceptibility χm and relative permeability µr, is
0%
a) χm=µr
0%
b) χm - 1=µr
100%
c) χm + 1=µr
0%
d) χm=1- µr
Q.7.
If M is magnetic moment developed in the material having volume V, then intensity of magnetization is given by the expression
0%
a)MV
0%
b) M / V
0%
c)M √V
100%
d)M / √V
Q.8.
The relation between B, H and I in S.I. unit is
0%
a) B=µo ( H + I)
0%
b) B=H + 4π I
0%
c)H=µo ( B + I)
100%
d)none of these
Q.9.
A temparary magnet is made of
0%
a) cast iron
0%
b) steel
0%
c)soft iron
100%
d)stainless steel
Q.10.
Water is..
0%
a) diamagnetic
0%
b) paramagnetic
100%
c) ferromagnetic
0%
d) none of these
Q.11.
The relative permeability of a medium is 0.What is its magnetic susceptibility?
0%
a)0.925
0%
b) -0.925
100%
c)1.075
0%
d)-1.075
Q.12.
The moment of magnet ( 15cm ×2cm × 1cm) is 1.2 A-mWhat is its intensity of magnetization ?
0%
a) 4 × 104 A/m
0%
b) 2 × 104 A/m
0%
c)104 A/m
100%
d)none
Q.13.
As magnetizing field on a ferromagnetic material is increased, its permeability..
0%
a) increases
0%
b) decreases
50%
c)remains constant
50%
d)can not say
Q.14.
Magnetic field do not interact with
0%
a) stationary charge
0%
b) moving electric charges
0%
c) stationary permanent magnet
100%
d) moving permanent magnets
Q.15.
Two identical thin bar magnets each of length l and pole strength m are placed at right angles to each other, with north pole of one touching south pole of the other , then the magnetic moment of the system is
0%
a)ml
0%
b) 2ml
0%
c)√2 ml
100%
d)ml/2
Q.16.
The ratio of magnetic potentials due to magnetic dipole in the end position to that in broad side on position for the same distance from it is
0%
a) zero
0%
b) ∞
0%
c)1
100%
d)2
Q.17.
A thin bar magnet of length 2l and breadth 2b pole strength p and magnetic moment M is divided into four equal parts with length and breadth of each part being half of original magnet. Then the pole strength of each part is
0%
a) p
0%
b) p/2
100%
c)p/4
0%
d)2p
Q.18.
In above question, magnetic moment of each part is
0%
a) M/4
0%
b) M
0%
c) M/2
100%
d) 2M
Q.19.
A circular loop is replaced by an equivalent magnetic dipole. then the equivalent magnetic dipole has a constant
0%
a)pole strength m of each pole
0%
b) length 2l of dipole
0%
c)product of m and 2l
100%
d)all of the above
Q.20.
In a bar magnet, the magnetic field lines...
0%
a) are not present
0%
b) depend upon the cross-section area of the magnet
0%
c)go from N-pole to s pole
100%
d)go from S-pole to N-pole
Q.21.
A magnetic needle hang using silk fiber oscillates in earth's magnetic field. If the temperature of this needle is raised beyond the curie temperature of the material of the needle, then [ CBSEB 2007]
0%
a)the periodic time of the oscillation will increase
100%
b) the periodic time of the oscillation will decrease
0%
c)the periodic time of the oscillation will not change
0%
d)the needle will stop oscillating
Q.22.
Which of the following has negative magnetic susceptibility?
0%
a) Ferromagnetic substance
50%
b) Paramagnetic substance
50%
c) Diamagnetic substance
0%
d) None of above
Q.23.
Which of the following has negative magnetic susceptibility
0%
a)Ferromagnetic substance
0%
b) Paramagnetic substance
0%
c)Diamagnetic substance
100%
d)None of the above
Q.24.
Magnetization intensity for vacuum is ... [GSEB 2008]
0%
a) negative
0%
b) positive
100%
c)∞
0%
d)0
Q.25.
A bar magnet with dipole moment m is kept perpendicular to a uniform magnetic field B. If it is released in this situation and it rotates and makes an angle θ with the magnetic field, then the work done in this process is ....
0%
a)MB
0%
b)MB cosθ
0%
c)MBsinθ
100%
d)MB(1-cosθ)
Q.26.
The earth's magnetic field in a closed iron box is .... than the magnetic field outside the box
0%
a) more
0%
b) less
0%
c) equal
100%
d) zero
Q.27.
A bar magnet has magnetic dipole moment M. Its initial position is parallel to a uniform magnetic field. In this position, the torque and force acting on its are .....
0%
a)0,0
0%
b) M × B and MB
100%
c)M . B and MB
0%
d)None of these
Q.28.
If we place a bar magnet in the magnetic meridian with its north pole towards geographic north, the neutral point will be
0%
a) on the axis of magnet
0%
b) on the equatorial line of magnet
100%
c)at 45° with axial line
0%
d)at 45° with equatorial line
Q.29.
A bar magnet is suspended with unspun thread. It lies in the magnetic meridian. the upper end of the thread is turned through 150°. It turns the magnet by 30° with the magnetic meridian. through what angle should the upper end of thread be turned to rotate the magnet through 90°
100%
a)360°
0%
b) 330°
0%
c)300°
0%
d)270°
Q.30.
Which of the following does not represent the unit for magneticdipole moment?
0%
a) Am2
0%
b) T/J
0%
c) J/T
100%
d) Nm/T
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