1.

Youngs modulus for steel is 2xx10^(11)N//m^(2). What is its value in C.G.S UNITS ?

Answer»

`2XX10^(10)`
`2xx10^(11)`
`2xx10^(12)`
`2xx10^(13)`

Solution :Here `n_(2)=n_(1)[M_(1)/(M_(2))]^(a)[L_(1)/L_(2)]^(b)[T_(1)/(T_(2))]^(C )`
Now `Y=[M^(1)L^(-1)T^(-2)]`
`i.e.a=1,b=-1,c=-2`
`n_(1)=2xx10^(11)N-m^(-2)`
Then `n_(2)=2xx10^(11)[(1kg)/(1g)][(1m)/(1CM)]^(-1)xx[(1SEC)/(1sec)]^(-2)`
`2xx10^(11)[(1000)/(1)][(100)/(1)]^(-1)xx[1]^(-2)`
`2xx10^(11)[(1000)/(100)]`
`2xx10^(12)` dyne `CM^(-2)`
`(c )` is correct


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