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WorksheetsMagnetism and matter.
Total questions: 10
Worksheet time: 6mins
two magnets have the same length and the same pole strength,but one of the magnets has a small hole at is center.then
both have equal magnetic moment
one with hole has small magnetic moment.
one with hole has large magnetic moment.
one with hole loses magnetism through the hole
A large magnet is broken into two pieces so that the lengths are in the ratio 2:1.the pole strength of the two pieces will have ratio
2 : 1
1:2
4:1
1:1
work done in rotating a bar magnet from 0 to 120 ° is
21 MB
23 MB
MB
32 MB
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
In a permanent magnet at room temperature
magnetic moment of each molecule is zero
the individual molecules have non zero magnetic moment which are all perfectly aligned
domains are partially aligned
domains are perfectly aligned
Hysteresis loss is minimized by using
alloy of steel
shell type of core
thick wire which has low resistance
metal
To make electromagnet, substance should be
high permeability and high susceptibility
low permeability and high susceptibility
high permeability and low susceptibility
low permeability and low susceptibility
