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 -

Options

A. exactly `39^(@)`
B. `30^(@)`
C. more than `39^(@)`
D. less than `39^(@)`

Answer

C

Explanation

`tantheta'=(tantheta)/(cosalpha)`
`:.theta'gt theta`