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Units and Measurement

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Physics Part I

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Physics

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Class 10 Class 12

The dimension of 1 half straight epsilon subscript straight o straight E squared comma space where space straight epsilon subscript straight o, is permittivity of free space and E is electric field is 

  • [ML2T-2]

  • [ML-1T-3]

  • [ML2T-1]

  • [MLT-2]


B.

[ML-1T-3]

Dimensions space of space straight epsilon subscript straight o space equals space left square bracket space straight M to the power of negative 1 end exponent straight L to the power of negative 3 end exponent straight T to the power of 4 straight A squared right square bracket
Dimensions space of space straight E space equals space left square bracket MLT to the power of negative 3 end exponent space straight A to the power of negative 1 end exponent right square bracket
Therefore comma space Dimensions space of space 1 half straight epsilon subscript straight o straight E squared space equals space left square bracket straight M to the power of negative 1 end exponent straight L to the power of negative 3 end exponent straight T to the power of 4 straight A squared right square bracket space straight x space left square bracket straight M squared straight L squared straight T to the power of negative 6 end exponent straight A to the power of negative 2 end exponent right square bracket

equals space left square bracket ML to the power of negative 1 end exponent straight T to the power of negative 3 end exponent right square bracket
Dimensions space of space straight epsilon subscript straight o space equals space left square bracket space straight M to the power of negative 1 end exponent straight L to the power of negative 3 end exponent straight T to the power of 4 straight A squared right square bracket
Dimensions space of space straight E space equals space left square bracket MLT to the power of negative 3 end exponent space straight A to the power of negative 1 end exponent right square bracket
Therefore comma space Dimensions space of space 1 half straight epsilon subscript straight o straight E squared space equals space left square bracket straight M to the power of negative 1 end exponent straight L to the power of negative 3 end exponent straight T to the power of 4 straight A squared right square bracket space straight x space left square bracket straight M squared straight L squared straight T to the power of negative 6 end exponent straight A to the power of negative 2 end exponent right square bracket

equals space left square bracket ML to the power of negative 1 end exponent straight T to the power of negative 3 end exponent right square bracket
523 Views

What is measurement?

Measurement is the process of attaching a numeric value to an aspect of a natural phenomenon. Measurement is making the quantitative knowledge of a physical quantity. 
1289 Views

Define unit.

The quantity used as a standard of measurement is called unit. 

Example: Unit of time is second. 

1172 Views

Give four examples of physical quantities.

Examples of Physical quantitie are force, mass, density and power.
821 Views

What is the need of measurement?

To get the complete knowledge of any physical quantity, measurement is needed. Measurement of any physical quantity involves comparison with a certain basic, arbitrarily chosen, internationally accepted reference standard called unit. Knowledge without measurement is incomplete and unsatisfactory. 
825 Views

Define physical quantity.

 


A measurable quantity in terms of which laws of Physics can be expressed is called physical quantity.

The result of a measurement of a physical quantity is expressed by a number accompanied by a unit.


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