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In the equation of a planimeter, ‘N’ is ______, when zero of the dial passes the index mark in a clockwise direction
1. + ve
2. - ve
3. 0
4. None of the above

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Correct Answer - Option 1 : + ve

Concept:

The areas between curved boundaries are also computed by planimeter from the map of the area. Most commonly used is Amsler polar Planimeter.

The formula for calculating areas of the map by using planimeter.

Area (A) = M × (FR – IR ± 10 N + C)

Where,

M = Multiplying constant, FR = Final reading of Planimeter, IR = Initial Reading, N = Number of times zero of dial pass is index mark, and C = Constant marked above scale division on tracing arm.

± ⇒ + ve sign when zero is passed in clockwise direction and – ve for when zero is passed in an anticlockwise direction.

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