Magnetism Flashcards
1
Q
What is dip at equator and poles?
A
Equator - 0
Poles - 90
2
Q
Accuracy limits of Compass
A
DRC - 10
RIMC - 1
3
Q
What causes Coefficient A?
A
misalignment of lubber line
4
Q
What causes Coefficient B?
A
presence of hard iron, max when east or west
5
Q
Total Deviation formula magnet
A
A + B sin heading + C cos heading
6
Q
What does magnetism caused by vertical soft iron vary with?
A
Varies with latitude not heading
7
Q
The slow change of earth magnetic variation is known as ?
A
secular
8
Q
Value of H
A
T cos dip
9
Q
Where are directive forces of earth’s magnetic field max?
A
Magnetic Equator
10
Q
What is the magnetic moment of a magnet?
A
product of pole strength and effective length
