A galvanometer, having a resistance of ${\rm{50}}\,\,{\rm{\Omega }}$, gives a full scale deflection for a current of $0.05\,\,A$. The length in meter of a resistance wire of area of cross-section $2.97\,\, \times \,\,{10^{ - 2}}\,\,{\rm{c}}{{\rm{m}}^2}$ that can be used to convert the galvanometer into a ammeter which can read a maximum of ${\rm{5}}\,\,{\rm{A}}$ current is (Specific resistance of the wire $ = 5\,\, \times \,\,{10^{ - 7}}\,\,{\rm{\Omega }}\,{\rm{m}}$

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JEE PHYSICS MCQ: MAGNETIC EFFECT OF CURRENT

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A galvanometer, having a resistance of

\mathrm{50}\,\,\mathrm{\Omega }

, gives a full scale deflection for a current of

0.05\,\,A

. The length in meter of a resistance wire of area of cross-section

2.97\,\, \times \,\,{10^{ - 2}}\,\,\mathrm{c}{\mathrm{m}^2}

that can be used to convert the galvanometer into a ammeter which can read a maximum of

\mathrm{5}\,\,\mathrm{A}

current is (Specific resistance of the wire

= 5\,\, \times \,\,{10^{ - 7}}\,\,\mathrm{\Omega }\,\mathrm{m}

View answer and explanation

Correct option: C

Option C (3) is correct because the length of the resistance wire is calculated using the shunt resistance formula and the specific resistance of the wire.

JEE PHYSICS MCQ: MAGNETIC EFFECT OF CURRENT

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