NEW
Font size
WorksheetsMAGNETISM AND MATTER
Total questions: 20
Worksheet time: 10mins
The susceptibility of a diamagnetic material does not depend on temperature
True
False
For making permanent magnet, steel is preferred over soft iron as it has high retentivity as well as high coercivity.
True
False
Soft iron retains magnetism once magnetic field is switched off.
True
False
SI unit of magnetic field intensity at a place is Wb / m2
True
False
Gauss law for magnetism is
the net magnetic flux through any closed surface is B. Δ s
the net magnetic flux through any closed surface is E. Δ s
the net magnetic flux through any closed surface is zero
both a and c
At a place angle of dip is 30 ° .If horizontal component of earths magnetic field is H,then the total intensity of magnetic field will be
2H
32H
2H
H 23
the value of angle of dip is zero at the magnetic equator because on it
V and H are equal
V and H are zero
V is zero
H is zero
The relative permeability of a substance x is slightly less than unity and that of substance y is slightly more than unity,then
x is paramagnetic and y is ferromagnetic
x is diamagnetic and y is ferromagnetic
x and y are paramagnetic
x is diamagnetic and y is paramagnetic
Three needles N1 N2 and N3 are made of a ferromagnetic, a paramagnetic and a diamagnetic substance respectively. A magnet, when brought close to them, will
attract N1 strongly, but repel N2 and N3 weakly.
attract all three of them.
attract N1 and N2 strongly but repel N3.
attract N1 strongly, N2 weakly and repel N3 weakly.
Angle of dip is 90° at
Equator
Poles
tropic of cancer
both poles and equator
A magnetic needle suspended parallel to a magnetic field requires root 3 J of work to turn it through 60°. The torque needed to maintain the needle in this position will be
1 J
2J
3J
4J
At a certain place on earth, BH = 1/ROOT 3 BV
angle of dip at this place is
30
45
60
90
A magnet of dipole moment M is aligned in equilibrium position in a magnetic field of intensity B. The work done to rotate it through an angle 0 with the magnetic field is
MB sin θ
MB cos θ
MB (1 – cos θ)
MB(l – sin θ)
45. Let the magnetic field on earth be modelled by that of a point magnetic dipole at the centre of earth. The angle of dip at a point on the geographical equator is
always zero
positive, negative or zero
unbounded
always negative
The vertical component of earth’s magnetic field . at a place is √3 times the horizontal component
the value of angle of dip at this place is
30
45
60
90
At a given place on earth’s surface the horizontal component of earth’s magnetic field is 2 × 103-5 T and resultant magnetic field is 4 × 103-5 T. The angle of dip at this place is
30
45
60
90
MAGNETIC MOMENT FOR BOHR MAGNETRON IS
QVR
QVR/2
QVR/4
QVR/8
PERMEABILITY IS
B/H
B2/H
B/H2
H/B
BOHR MAGNETON IS GIVEN BY
9.27 * 10 -24 Am -2
9.24* 10 -27 Am -2
9.72* 10 -27 Am -2
9.27 * 10 -22 Am -1
