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Magnetic declination is
1. the deflection of magnetic needle due to external magnetic sources
2. the error in the bearings due to external magnetic influences
3. the angle between the true meridian and the magnetic meridian at a place
4. the dip of the needle to the earth’s magnetic field

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Correct Answer - Option 3 : the angle between the true meridian and the magnetic meridian at a place

Explanation:

Magnetic Declination:

(i) It is quite a common phenomenon that the magnetic meridian and the true meridian at a place generally do not coincide.

(ii) The horizontal angle which the magnetic meridian makes with the true meridian is called as magnetic declination (also sometimes referred as declination).

Negative Declination:

(i) When magnetic north lies towards the west of true north, then the declination is said to be negative.

Positive Decilination:

(i) If the magnetic north lies towards the east of true north, then declination is said to be positive.

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