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A dip circle is so set that the dip need...

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 -

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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

A dip circle is adjusted so that its needle moves freely in the magnetic meridian. In this position, the angle of dip ia 45^(@) . 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 true dip angle is 60°. The apparent dip when plane of dip circle is at an angle of 30° with the magnetic meridian is

At a place true dip angle is 60°. The apparent dip when plane of dip circle is at an angle of 30° with the magnetic meridian is

At an angle of 30^(@) to the magnetic meridian, the apparent dip is 45^(@) . Find the true dip: