The angle of dip at a certain place on earth is $60^o$ and the magnitude of earth's horizontal component of magnetic field is $0.26\, G$. The magnetic field at the place on earth is.....$G$

Ratio between total intensity of magnetic field at equator to poles is

A line passing through places having zero value of magnetic dip is called

A dip circle is at right angle to the magnetic meridian. What will be the apparent dip......$^o$

The value of the horizontal component of the earth's magnetic field and angle of dip are $1.8 \times {10^{ - 5}}\,Weber/{m^2}$ and $30°$  respectively at some place. The total intensity of earth's magnetic field at that place will be

If $\theta _1$ and $\theta_2$ be the apparent angles of dip observed in two vertical planes at right angles to each other, then the true angle of dip $\theta$ is given by