a) Compute the magnetic field (H) required to align the dipole m (Figure 3) at r
ID: 106729 • Letter: A
Question
a) Compute the magnetic field (H) required to align the dipole m (Figure 3) at room temperature (300 oK) given that:
m = 1.85 x 10-23 A m2,
Aligning energy: Em = m*H; and -16 Thermal energy: ET = k T; k = Boltzmann constant = 1.38 x 10 erg/ K
b) Examine the aeromagnetic map below and state if the anomaly is likely to be due to induced or remanent magnetization; justify your answer. Use at least two methods to estimate the depth to the source of the anomaly
excellent answer= rate
m Figure 3: A dipole m in an external field HExplanation / Answer
a)m=1.85×10^-23A m2
Thermal energy ET=kT=1.38×10*300=4140 J
The magnetic field is calculated as follows,
H is measured in terms of A/m.
H=m*length of dipole
The length of dipole is considered to be equal to 1m.
H=1.85×10^-23*1=1.85×10^-23A/m
Aligning energy=m*H=1.85×10^-23*1.85×10^-23=3.44×10^-46A2/m3
b)The anomaly is due to induced magnetization and due to this the magnetic field spreads at a fast rate throughout the region. The methods to estimate the depth to source of anomaly is -estimating th strength of magnetic field and next is-estimating the value of magnetic flux in that region.
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