Q.

A Dip circle lying initially in the magnetic meridian, the angle of dip is 45o. Now dip circle is rotated through 30o in the horizontal plane. The apparent angle of dip is

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a

Tan-123

b

Tan-132

c

Tan-12

d

Tan-112

answer is A.

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Detailed Solution

tan δ1=tanδcosθ=tan45cos30=1 x 23δ1=tan-123
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