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Angle of dip is 90^@ at:...

Angle of dip is `90^@` at:

A

poles

B

equator

C

both (a) and (b)

D

none of these

Text Solution

Verified by Experts

The correct Answer is:
A
poles
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For a place, the true value of angle of dip is 30^@ . Find the apparent dip angle when the plane of dip circle is rotated through 45^@ from the magnetic meridian.

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Knowledge Check

  • Angle of dip is zero at

    A
    poles
    B
    between poles of equator.
    C
    equator
    D
    none of these

  • A dip circle is so that its needle moves freely in the magnetic meridian. In this position, the angle of dip is 40^@ . Now the dip circle is rotated so that the plane in which the needle moves makes an angle of 30^@ with the magnetic meridian. In this position, the needle will dip by an angle

    A
    `40^@`
    B
    `30^@`
    C
    more than `40^@`
    D
    less than `40^@`

  • In a vertical plane p_(1) making angle 30^(@) with magnetic meridian , apparent angle of dip is 60^(@) . The apparent angle of dip in vertical plane p_(2) , which is perpendicular to plane p_(1) is

    A
    `30^(@)`
    B
    `45^(@)`
    C
    `tan^(-1)(3)`
    D
    `tan^(-1)((1)/(3))`

    • Similar Questions

    Explore conceptually related problems

    A dip circle is so set that the dip needle moves freely in the magnetic meridian. In this position the angle of dip is 39^(@) . Now, the dip circle is rotated so that the plane in which the needle moves makes an angle of 30^(@) with the magnetic meridian. In this position, the needle will dip by an angle -

    A dip circle is adjusted so that its needle moves freely in the magnetic meridian. In this position, the angle of dip ia 40^(@) . Now the dip circle is rotated so that the plane in which the needle moves makes an angle of 30^(@) with the magnetic meridian. In this position the needle will dip by an angle

    At a place the true value of angle of dip is 60^(@) . If dip circle is rotated by phi^(@) from magnetic meridian, the angle of dip is found to be tan^(-1)(2) . Then the value of phi is

    We can define two planes for a particular location on the surface of earth. One is called magnetic meridian and the other is called geographic meridian. Magnetic meridian for a point on the surface of earth is defined as a plane passing through this point and containing magnetic axis of earth. Similarly geographic meridian for a point on the surface of earth is defined as plane passing through this point and containing geographic axis of rotation. If we draw these two planes for a point on the surface of earth then in general these are found at some angle. Angle between these two planes is called declination for that place. Importance of magnetic meridian at a point is that net magnetic field vector of earth for that point lies on this plane. Usually net magnetic field of earth is inclined at some angle with the horizontal and this angle is called angle of dip for that place. How many points are there on surface of earth where angle of dip is 90^@ ?

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