1.

A dipcircle is initally in the magnetic meridianif it is now ratated throiugh an angle thetain the horizontalplane then the tangent of the new angle of dip is increased in the ratio

Answer»

`(TAN PHI)/(tan Phi)=(1)/(SIN theta)`
`(tan Phi)/(tan Phi)=(1)/(cos theta)`
`(tan Phi)/(tan Phi)=(1)/(tantheta)`
`(tan Phi)/(tan Phi)=(1)/(cottheta)`

Solution :Let `Phi` =ANGLE of thedip
`therefore tan Phi =(V)/(H)`
then tan `Phi=(V)/(H)=(V)/(H cos theta)`
Then `(tan Phi)/(tan Phi)=(1)/(cos theta)`


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