Two charges 2 microcoulomb and -2 microcoulomb are placed at (-4.5,0,0) and (4.5,0,0) are respectively in an external field e=9×10^6/r^2 N/c. Find the energy of the system in the external field.
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In order to estimate the frictional head loss in a pipe 1 m in diameter, through
which castor oil of specific gravity 0.96 and dynamic viscosity 9.9 poise, is to
be transported at the rate of 5000 litres per second, a test was conducted on
a pipe of diameter 50 mm using water at 15°C as the model fluid. Calculate
the discharge required for the model pipe.
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