Due to the earth's magnetic field,charged cosmic ray particles

  • A
    Can never reach the equator
  • B
    Require less kinetic energy to reach the equator than the poles
  • C
    Require greater kinetic energy to reach the equator than the poles
  • D
    Can never reach the poles

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Reason: $A$ dip needle will stay vertical at the north pole of the Earth.

$A$ small bar magnet $A$ oscillates in a horizontal plane with a period $T$ at a place where the angle of dip is $60^o$. When the same needle is made to oscillate in a vertical plane coinciding with the magnetic meridian,its period will be

The vertical component of the earth's magnetic field is zero at a place where the angle of dip is.....$^o$

The angle of dip at a certain place is $30^o$. If the horizontal component of the earth's magnetic field is $H$,the intensity of the total magnetic field is:

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