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The external and internal diameters of a...

The external and internal diameters of a hollow cylinder are measured to be `(4.23+-0.01)` cm and `(3.89+-0.01)`cm. The thickness of the wall of the cylinder is

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The correct Answer is:
`9.30`
`E_(x)=E_(0)+2E_(0) cos 30^(@)+2E_(0) cos 60^(@)=(2+sqrt(3))E_(0)`
`E_(y)=E_(0), tan theta=E_(y)/E_(x)=1/(2+sqrt(3))xx2-sqrt(3), theta=15^(@)`
The hour hand will point towards `9:30`
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