The lines joining the places of the same horizontal intensity are known as

  • A

    Isogonic lines

  • B

    Aclinic lines

  • C

    Isoclinic lines

  • D

    Isodynamic lines

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Name the elements of the earth’s magnetic field.

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  • [KVPY 2020]

A compass needle free to turn in a horizontal plane is placed at the centre of circular coil of $30$ turns and radius $12 \;cm .$ The coil is in a vertical plane making an angle of $45^{\circ}$ with the magnetic meridian. When the current in the coil is $0.35 \;A$, the needle points west to east.

$(a)$ Determine the horizontal component of the earth's magnetic field at the location.

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