The Earth's Magnetism

Two coils, each of $100$ turns, are held such that one line in the vertical plane with their centres coinciding. The radius of the vertical coil is $20 \mathrm{cm}$ and that of the horizontal coil is $30 \mathrm{cm}$. How would you neutralize the magnetic field of the earth at their common centre? What is the current to be passed through each coil? Horizontal of earth's magnetic induction$=3.49 \times {10}^{-5} T$ and angle of dip $=30°$..

We say that at places like Delhi and Mumbai, a magnetic needle shows the true north direction quite accurately as compared to other places in India.

The given statement is True or False?

Assertion: The geographic north-pole does not coincide with the magnetic north pole.

Reason: The axis of the hypothetical dipole inside the earth is tilted by approximately $11.3^{\circ }$ with respect to the axis of rotation of the earth.

Magnetic south pole of the earth is towards geographic _____.    
 

The North pole of earth's magnet is in the geographical north.

Which magnetic pole is at the geographic South Pole of Earth?

The south pole of earth's magnet is in the

The dip angle in a vertical plane perpendicular to magnetic meridian will be _____degrees.

What is dip circle?

A line passing through the places having zero value of magnetic dip is called _____ (aclinic/isoclinic) line.

A dip needle in a plane perpendicular to the magnetic meridian will remain (vertical/horizontal).

The net magnetic field at neutral points is _____.

The angle between magnetic meridian and geographical meridian is called angle of _____.

The value of the angle of dip at magnetic equator of earth is zero.

The angle between magnetic meridian and geographical meridian is called angle of _____.

The net magnetic field at neutral points is _____.

A compass needle which is allowed to move in a horizontal plane is taken to a geomagnetic pole. It

What is the value of the angle of dip at magnetic poles of earth?

In the magnetic meridian of a certain place, the horizontal component of the earth's magnetic field is $\frac{\sqrt{3}}{5}\mathrm{G}$ and the dip angle of a magnetic needle is $30°$. What is the magnetic field of the earth at this location?

A magnet is suspended so that it oscillates in a horizontal plane. It performs $20$ oscillations per minute at a place where dip is $30°$ and $15$ oscillations per minute at a place where dip is $60°$. Compare the earth's total magnetic fields at these two places.