Heat at the rate of 200 W is produced in an X-ray tube operating at 20 kV. Find the current in the circuit. Assume that only a small fraction of the kinetic energy of electrons is converted into X-rays.
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P = VI
⇒ I = P/V
⇒ I = 200/20 × 10^{-3}
⇒ I = 1/100
⇒ I = 0.01 A
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