What is the angle of dip at a place where the horizontal component of the earth’s magnetic field is equal to the vertical component?
The angle of dip is given by:
δ = tan−1(Bv / Bh)
where Bv = vertical component of earth's magnetic field & Bh = horizontal components of earth's magnetic field
Here, Bv = Bh
► δ = tan−1(1) = 45o
How can a magnetic field be produced?
An electric current as well as the permanent magnet produces a magnetic field whereas a temporary magnet fails to do so.
Which one of the Maxwell’s laws leads to the conclusion that there are no magnetic field loops that are not closed?
Gauss’s law for magnetism states that no magnetic monopoles exist and that the total flux through a closed surface must be zero.
What is the relation between dipole moment pm, volume of bar magnet V and intensity of magnetization M?
Magnetization is the net dipole moment aligned per unit volume.
M = pm / V
If we place a bar magnet in the magnetic meridian with its north pole towards geographic north, the neutral point will be:
Which combination of magnetic field lines and poles shows two magnets repelling each other?
Magnetic field strength due to a short bar magnet on its axial line at a distance x is B. What is its value at the same distance on the equatorial line?
The magnetic field at any axial point is given by, B = 2μo/ 4πx3
Similarly, the field at any equatorial point is given by, B = μo/ 4πx3
Thus, the field at any equatorial point is half of what it is at an axial point.
When the switch is closed a magnetic field is produced by the coil. Which option shows the shape of the field?
If the magnet is suspended at an angle 30° to the magnetic meridian, the dip needle makes an angle 60o with the horizontal. What is the true dip?
Angle of dip, δ = 30º
► tanδ′ = tanδ / cosθ
► tanδ = (tan 60º) * (cos30°) = (√3) * (√3 / 2) = 3 / 2
∴ Real dip, δ′ = tan−1 (3/2)
A compass has a small balanced pointer that always points North-South. This is because: