QJEEM24Ph51e7: JEE Main 2024 Physics - Class 12 JEEM24Ph51e7 Solution: The resistance per centimeter of a meter bridge wire is r ,…

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QJEEM24Ph51e7: JEE Main 2024 Physics - Class 12 JEEM24Ph51e7 Solution: The resistance per centimeter of a meter bridge wire is r ,…

The resistance per centimeter of a meter bridge wire is $r$ , with $X Ω$ resistance in left gap. Balancing length from left end is at $40 cm$ with $25 Ω$ resistance in right gap. Now the wire is replaced by another wire of $2 r$ resistance per centimeter. The new balancing length for same settings will be at

Multiple Choice Options

A 10 cm
B 80 cm
C 40 cm
D 20 cm

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Accepted Answer

JEE Main 2024 (Online) 31st January Evening Shift Physics - Current Electricity Question 49 English Explanation

$\begin{aligned} \frac{25}{r ℓ_{1}} = \frac{X}{r ℓ_{2}} .... (i) \\ \frac{25}{2 r ℓ_{1}^{'}} = \frac{X}{2 r ℓ^{'}_{2}} .... (ii) \end{aligned}$

From (i) and (ii)

$ℓ_{2}^{'} = ℓ_{2} = 40 cm$

QJEEM24Ph51e7: JEE Main 2024 Physics - Class 12 JEEM24Ph51e7 Solution: The resistance per centimeter of a meter bridge wire is r ,…

Multiple Choice Options

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