NEET UG PHYSICS MCQ: CURRENT ELECTRICITY

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Analyzing +4 | -1

Two bulbs

\mathrm{40}\,\,\mathrm{W}

and

\mathrm{60}\,\,\mathrm{W}

and rated voltage

\begin{array}{llllllllllllllllllll} {\mathrm{240}\,\,\mathrm{V}} \end{array}

are connected in series across a potential difference of

\begin{array}{llllllllllllllllllll} {\mathrm{420}\,\,\mathrm{V}} \end{array}

. Which bulb will work at above its rated voltages?

View answer and explanation

Correct option: B

\begin{array}{llllllllllllllllllll} {\mathrm{60}\,\,\mathrm{W}\,\,{\mkern 1mu} \mathrm{bulb}} \end{array}

The correct answer is

\begin{array}{llllllllllllllllllll} {\mathrm{60}\,\,\mathrm{W}\,\,{\mkern 1mu} \mathrm{bulb}} \end{array}

because it has lower resistance and thus a larger voltage drop across it when connected in series.

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\mathrm{is}\,\,\mathrm{/}\,\,\mathrm{are}