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?

What is dynamo effect?

Why are magnetic North Pole and geographical North poles are different?

Select the correct answer:

What is geographical north pole?

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?

Magnetic declination is defined as the angle between magnetic north and true north.

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?

The Earth's magnetic field at a certain place has a horizontal component of $0.3 \text{Gauss}$ and a total strength of $0.5 \text{Gauss}$. The angle of dip is ${\tan }^{-1}\left(\frac{4}{n}\right)$. The value of $n$ is _____.

The Earth's magnetic field at a certain place has a horizontal component of $0.3 \text{Gauss}$ and a total strength of $0.5 \text{Gauss}$. Find the vertical component of earth's magnetic field and also find the angle of dip.

The Earth's magnetic field at a certain place has a horizontal component of $0.3 \text{Gauss}$ and a total strength of $0.5 \text{Gauss}$. The angle of dip is

At a certain place, the angle of dip is ${60}^o$ and the horizontal component of the earth's magnetic field $\left(B_H\right)$ is $0.8\times {10}^{-4} \mathrm{T}.$ The earth's overall magnetic field is

At a certain place, the angle of dip is ${30}^o$ and the horizontal component of earth's magnetic field is $0.50$ oersted. The earth's total magnetic field (in oersted) is

The relation between $B_h, B_v$ and $B$ is ________.

The horizontal component of earth's magnetic field at certain place is $B_{\mathit{H}}=0.5\times {10}^{-4} \mathrm{Wb}/{\mathrm{m}}^2$ and dip angle is ${45}^o$. Find vertical component of earth's magnetic field.

What are elements of earth's magnetism? Define them and show with a labeled diagram.