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Physics · UNITS AND MEASUREMENT

हिन्दी

As shown in the figure, plane angle \( d\theta \) is defined as the ratio of the length of arc \( ds \) to the radius \( r \). What is the SI unit for this plane angle?

  1. steradian (sr)
  2. radian (rad)
  3. degree
  4. radian per metre

Correct answer · Option 2

radian (rad)

Explanation

The unit for plane angle is radian with the symbol rad, which is a dimensionless quantity.
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