7.A wire of length 2m extends by 2mm 1 point
when a force is applied to it. Calculate
stress produced in it if
Y=2*10^11N/m^2. *
O (a) 1*10^8N/m^2
O (b) 2*10^8N/m^2
O (c) 3*10^8N/m^2
O (d) 4*10^8N/m^2
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