Question
$X-$ rays are produced in $X-$ ray tube operating at a given accelerating voltage. The wavelength of the continuous $X-$ rays has values from
All wavelengths $>\lambda_{\min }$ are found, where
$\lambda_{\min }=\frac{12375}{V(\text {involt})} A$
Here $V$ is the applied voltage
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$(a)$ The time elapsed before the current acquires half of its steady - state value
$(b)$ The energy stored in the magnetic field associated with the coil at an instant $15\,ms$ after the circuit is switched on. (Given In $2=0.693$, $\left.e ^{-3 / 2}=0.25\right)$
