When the load on a wire is increased slowly from 1 kg wt to 2 kg wt the elongation increases from 0.2 mm to 0.3 mm. How much work is done during the extension ? `(g=9.8m//s^(2))`A. `1.96xx10^(-3)J`B. `19.6xx10^(-3)J`C. `0.196xx10^(-3)J`D. `16xx10^(-3)J`

When the load on a wire is increased slowly from 1 kg wt to 2 kg wt th

1.	When the load on a wire is increased slowly from 1 kg wt to 2 kg wt the elongation increases from 0.2 mm to 0.3 mm. How much work is done during the extension ? `(g=9.8m//s^(2))`A. `1.96xx10^(-3)J`B. `19.6xx10^(-3)J`C. `0.196xx10^(-3)J`D. `16xx10^(-3)J`
Answer» Correct Answer - A `W_(2)-W_(1)=(1)/(2)(F_(2)l_(2)-F_(1)l_(1))` `=(1)/(2) g[l_(2)m_(2)-m_(1)l_(1)]` `=(1)/(2) g[2xx0.3 xx 10^(-3)-1xx0.2 xx 10^(-3)]` `=(1)/(2) xx 9.8 xx 10^(-3) [ 0.6 -0.2]` `=4.9xx10^(-3) [ 0.4]` `=19.6 xx10^(-3)J`.

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When the load on a wire is increased slowly from 1 kg wt to 2 kg wt the elongation increases from 0.2 mm to 0.3 mm. How much work is done during the extension ? `(g=9.8m//s^(2))`A. `1.96xx10^(-3)J`B. `19.6xx10^(-3)J`C. `0.196xx10^(-3)J`D. `16xx10^(-3)J`

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