The bulb of a motorcycle head-lamp is marked 40W, 6V. The resistance of the filament when it is switched on is

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\(\frac{6^2}{40^2}\)ohms

\(\frac{40}{6^2}\)ohms

\(\frac{40}{6}\)ohms

6 x 40 ohms

\(\frac{6^2}{40}\)ohms