The magnetic moment of a bar magnet is thus ...A... to the magnetic moment of an equivalent solenoid that produces the same magnetic field. Here, refers to
unequal
different
equal
same
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The magnetic moment of a bar magnet is thus equal to the magnetic moment of an equivalent solenoid that produces the same magnetic field.
The pole strength of the magnet does not depend on
area of cross-section
length of the magnet
nature of material
both (a) and (b)
A magnetic needle suspended parallel to a magnetic field requires of work to turn it through . The torque needed to maintain the needle in this position will be:
According to work energy theorem
From equation (i) and (ii)
Magnetic lines of force due to a bar magnet do not intersect because
a point always has a single net magnetic field
the lines have similar charges and so repel each other
the lines always diverge from a single force
None of these
The magnetic lines of force inside a bar magnet
are from -pole to -pole of magnet
do not exist
depend upon the area of cross section of bar magnet
are from S-pole of magnet
A circular loop carrying a current is replaced by an equivalent magnetic dipole. A point on the axis of the loop is in
end-on position
both
broadside-on position
A bar magnet has a length . The magnetic field at a point at a distance from the centre in the broad sideon position is found to be . The pole strength of the magnet is.
Magnetic field due to a bar magnet in the broad-side on position is given by
After substituting the values and simplifying we get
The work done in turning a magnet of magnetic moment by an angle of from the meridian, is
times the corresponding work done to turn it through an angle of . The value of is
given by
2
1
0.5
Magnetic moment ; Initial angle through which magnet is turned and final angle which magnet is turned . Work done in turning the magnet through
.
Similarly,
or .
The ratio of magnetic fields due to a smaller bar magnet in the end on position to broad side on position is
Let be the distance of a point on the axis of a bar magnet from its centre. The magentic field at such a point is proportional to
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