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Stress and Strain Class 11th

A Wheatstone bridge is used to determine the value of unknown resistance X by adjusting the variable resistance Y as shown in the figure. For the most precise measurement of X, the resistance P and Q

 
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Raj Pandey

Contributor-Level 9

Resistance of P & Q should be approximately equal as it decreases error in experiment.

New answer posted

2 months ago

Stress and Strain Class 11th

Four identical hollow cylindrical columns of mild steel support a big structure of mass 50 * 103 kg. The inner and outer radii of each column are 50cm and 100cm respectively. Assuming uniform local distribution, calculate the compression strain of each column.

[Use Y = 2.0 * 1011 Pa, g = 9.8 m/s2]
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Vishal Baghel

Contributor-Level 10

Load of mass will be equally distributed among the four colours so force on each columns will be 125 * 103 N.

Cross section area of the column = π [ ( 1 ) 2 − ( 0 . 5 ) 2 ] = 2 . 3 5 5 m 2

Using young's modulus :  ε = σ Y = F A Y = 1 2 5 * 1 0 3 2 . 3 5 5 * 2 * 1 0 1 1 = 2 . 6 5 * 1 0 − 7

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