Question

Which of the following independent quantities is not used to specify the earth's magnetic field. ?

• A. Magnetic declination $\left(\theta \right)$
• B. Magnetic dip $\left(\delta \right)$
• C. Horizontal component of earth's field $\left(B_H\right)$
• D. Vertical component of earth's field $\left(B_V\right)$

Answer 1

The correct option is D Vertical component of earth's field $\left(B_V\right)$

The three basic quantities that decide the magnetic field of the Earth are:

1. Magnetic declination $\left(\theta \right)$: It tells about the declination between magnetic north and south pole and the geographic north and south pole.

2. Magnetic dip $\left(\delta \right)$: It is the angle made by the magnetic field lines with the horizontal at any point.

3. Horizontal component of Earth's magnetic field $\left(B_H\right)$.

The vertical component of Earth's field will have no effect on the magnetic field of the Earth.