Explanation:
When we replace a circular current-carrying loop with a magnetic dipole to resemble field lines of the circular loop, the pole strength m and the distance between the poles are not fixed.
But the magnetic dipole moment of both systems is always fixed. It is the product of the magnetic moment and the distance between the poles. In other words, md is fixed.
A current loop of area A and current I can be replaced with a magnetic dipole of dipole moment md.
i.e. md = IA
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A particle is moving in a uniform magnetic field, then
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(a) Its momentum changes but total energy remains the same |
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(b) Both momentum and total energy remain the same |
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(c) Both will change |
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(d) Total energy changes but momentum remains the same |
The frequency response curve of RC coupled amplifier is shown in figure. The band width of the amplifier will be
(a) 
|
(b) 
|
(c) 
|
(d) 
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The ionisation energy of hydrogen atom is 13.6 eV. Following Bohr's theory, the energy corresponding to a transition between the 3rd and the 4th orbit is
|
(a) 3.40 eV |
(b) 1.51 eV |
(c) 0.85 eV |
(d) 0.66 eV |
Figure shows the cross-sectional view of the hollow cylindrical conductor with inner radius 'R' and outer radius '2R', cylinder carrying uniformly distributed current along it's axis. The magnetic induction at point 'P' at a distance 
from the axis of the cylinder will be
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(a) Zero |
(b) |
(c) |
(d) |
Ionization energy of hydrogen is 13.6 eV. If h = 6.6 
, the value of R will be of the order of
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(a) |
(b) |
(c) |
(d) |
An air bubble in sphere having 4 cm diameter appears 1 cm from surface nearest to eye when looked along diameter. If amg = 1.5, the distance of bubble from refracting surface is
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(a) 1.2 cm |
(b) 3.2 cm |
(c) 2.8 cm |
(d) 1.6 cm |
