JEE PHYSICS MCQ: CURRENT ELECTRICITY

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Application +4 | -1

A fuse wire of circuit cross-section and having diameter of

\mathrm{0}\mathrm{.4}\,\,\mathrm{mm}

, allows

\mathrm{3}\,\,\mathrm{A}

of current to pass through it. But if another fuse wire of same material and circular cross-section and having diameter of

\mathrm{0}\mathrm{.6}\,\,\mathrm{mm}

is taken, then the amount of current passed through the fuse is

View answer and explanation

Correct option: C

3 \times {\left( {\;\frac{3}{2}} \right)^{3/2}}\;\mathrm{A}

Option C (

3 \times {\left( {\;\frac{3}{2}} \right)^{3/2}}\;\mathrm{A}

) is correct because the current carrying capacity of a fuse wire is proportional to the 3/2 power of its radius.

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