At a given place on the Earth,the angle between the Magnetic Meridian and the Geographic Meridian is called . . . . . . .

The horizontal component of Earth's magnetic field at a place is $3.5 \times 10^{-5} \,T$. $A$ very long straight conductor carrying a current of $\sqrt{2} \,A$ in the direction from South-East to North-West is placed. The force per unit length experienced by the conductor is $..............$ $\times 10^{-6} \,N/m$.

What is the most accepted scientific explanation for the origin of the Earth's magnetic field?

Which of the following statements proves that Earth has a magnetic field?

The vertical component of the earth's magnetic field is zero at a place where the angle of dip is.....$^o$

Explain the angle of dip.