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QAIPM-2015-Ph-1237: NEET 2015 Physics - Class 12 AIPM-2015-Ph-1237 Solution: A potentiometer wire of length L and a resistance r are…

A potentiometer wire of length L and a resistance r are connected in series with a battery of e.m.f.

E_0

and a resistance

r_1

. An unknown e.m.f. E is balanced at a length l of the potentiometer wire. The e.m.f. E will be given by

\frac{LE_0l}{(r+r_1)}

\frac{LE_0r}{lr_1}

\frac{LE_0r}{(r+r_1)l}

\frac{E_0r}{(r+r_1)}\cdot\frac{l}{L}

A ${{{E_0}l} \over L}$ L E 0 _ l _
B ${{L{E_0}r} \over {\left( {r + {r_1}} \right)l}}$ ( r + r 1 _ ) l L E 0 _ r _
C ${{L{E_0}r} \over {l{r_1}}}$ l r 1 _ L E 0 _ r _
D ${{{E_0}r} \over {\left( {r + {r_1}} \right)}}.{l \over L}$ ( r + r 1 _ ) E 0 _ r _ . L l _

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