exposure system consisted of a square-shaped Helmholtz coil, which was wound over a Teflon frame of dimension 35 x 35 x 20 cm (l x b x h); an uninterrupted power supply (UPS) provided less than 1% output voltage variation ensuring stable magnetic field generation; a step down transformer was used to reduce voltage down to 15 V, reducing the electric field component; the current source (step down transformer, rheostat etc.) was shielded by mild steel sheet enclosures
Central Power Research Institute (CPRI), Ministry of Power, India
Council of Scientific and Industrial Research (CSIR), New Delhi, India
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