First slide
Dimensions
Question

Which two of the following five physical parameters have the same dimensions ?

1. energy density
2. refractive index
3. dielectric constant
4. Young’s modulus 5. magnetic field

Moderate
Solution

 [Energy density ]= Work done  Volume =MLT2LL3=ML1T2 [Young's modulus ]=[Y]= Force  Area ×[l][Δl]=MLT2L2LL=ML1T2

The dimensions of 1 and 4 are the same.

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