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The true value of dip at a place is 45^@...

The true value of dip at a place is `45^@`. If the vertical plane carrying the needle is turned through `60^@` from the magnetic meridian, find the inclination of the needle (i.e. what will be the apparent value of dip)?

Text Solution

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Here, `delta=45^@, theta=60^@, delta^'=?`
`tan delta^'=(tan delta)/(cos theta)=(tan 45^@)/(cos 60^@)=(1)/(1//2)=2`
`:. delta^'=tan^-1(2)=63*4^@`
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