A thermonuclear device consists of a torus of diameter 3 m with a tube of diameter 1m, containing deuterium gas at 10 –2 mm mercury pressure and at room temperature. A bank of capacitors of 1200µF is discharged through the tube at 40 kV. If only 10% of the electrical energy is transformed to plasma kinetic energy, then the maximum temperature attained is..............×10 2 K. Assuming that the energy is equally shared between the deutrons and electrons in the plasma.
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Cross-sectional area of the torus 
meter 
Circumference 
meter
∴ Volume of Torus 
Pressure of the gas 
From gas equation 
we have 
The energy obtained from the discharge
Energy transformed to plasma K.E.
We know that the average kinetic energy associated with the gas molecule is given as 
Since, each deuterium molecule produces two ions and two electrons, hence
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