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Q.

A vector needs three quantities for its specification. Which of the following independent quantities is not used to specify the earth’s magnetic field ?

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a

Magnetic declination (θ)

b

Magnetic dip (δ)

c

Horizontal component of earth’s field (BH)

d

Vertical component of earth’s field (BV)

answer is D.

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Detailed Solution

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The three basic quantities that decide the magnetic field of the Earth are:
1. Magnetic declination (θ): It tells about the declination between magnetic north and south pole and the geographic north and south pole.

2. Magnetic dip (δ): It is the angle made by the magnetic field lines with the horizontal at any point.

3. Horizontal component  of Earth's magnetic field (BH).

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

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