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The magnetic field of earth can be earth...

The magnetic field of earth can be earth can be modelled by that of a point dipole placed at the centre of the earth . The dipole axis makes an angle of `11.3^(@)` with the axis of earth . At Mumbai , declination is nearly zero . Then

A

the declination varies between `11.3^(@)W " to " 11.3^(@)E`

B

the leat declination is `0^(@)`

C

the plane defined by the dipole axis and earth axis passes through Greenwich

D

declinaton averaged over earth must be always negative

Text Solution

Verified by Experts

The correct Answer is:
A
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Knowledge Check

  • if the earth's magnetic field is supposed to be due a magnetic dipole placed at the centre of earth , then the angle of dip at a point on the geographic equator

    A
    is always zero
    B
    can be zero at specific points
    C
    can be positive or negative
    D
    depends on existing conditions

  • The earth's magnetic field at a certain place has a horizontal component 0.3G and the total strength 0.5G the angle of dip is

    A
    `tan^(-1)(3/4)`
    B
    `sin^(-1)(3/4)`
    C
    `tan^(-1)(4/3)`
    D
    `sin^(-1)(3/5)`

  • The vertical component of the earth's magnetic field is zero at the

    A
    magnetic poles
    B
    magnetic equator
    C
    geographic poles
    D
    `45^@` latitude

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