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Use of Dimensional Equation.
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Use of dimensional Equation —

(a) To change the value of a physical quantity from one system to another.

$N _{1} U _{1}= N _{2} U _{2}$

(b) To check the accuracy of an equation.

This is based on the principle of homogeneity. In a physical equation every term should have the same dimensions.

(c) To establish an equation.

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